diff --git a/stage0/src/CMakeLists.txt b/stage0/src/CMakeLists.txt
index ba3bbf1b30..f75f8adf63 100644
--- a/stage0/src/CMakeLists.txt
+++ b/stage0/src/CMakeLists.txt
@@ -515,6 +515,7 @@ install(DIRECTORY "${CMAKE_BINARY_DIR}/lib/" DESTINATION lib
   PATTERN temp EXCLUDE)
 
 # symlink source into expected installation location for go-to-definition, if file system allows it
+file(MAKE_DIRECTORY ${CMAKE_BINARY_DIR}/src)
 if(${STAGE} EQUAL 0)
   file(CREATE_LINK ${CMAKE_SOURCE_DIR}/../../src ${CMAKE_BINARY_DIR}/src/lean RESULT _IGNORE_RES SYMBOLIC)
 else()
diff --git a/stage0/src/Init/System/IO.lean b/stage0/src/Init/System/IO.lean
index 582ec001c7..e2a31985e3 100644
--- a/stage0/src/Init/System/IO.lean
+++ b/stage0/src/Init/System/IO.lean
@@ -421,7 +421,7 @@ where
           if (← enter p) then
             go p'
       | FS.FileType.dir => go d.path
-      | _ => return ()
+      | _ => pure ()
 
 end System.FilePath
 
diff --git a/stage0/src/Lean/Elab/LetRec.lean b/stage0/src/Lean/Elab/LetRec.lean
index d3d6fcab0b..5a0f539223 100644
--- a/stage0/src/Lean/Elab/LetRec.lean
+++ b/stage0/src/Lean/Elab/LetRec.lean
@@ -59,13 +59,13 @@ private def mkLetRecDeclView (letRec : Syntax) : TermElabM LetRecView := do
         else
           liftMacroM $ expandMatchAltsIntoMatch decl decl[3]
       pure {
-        ref           := decl,
-        attrs         := attrs,
-        shortDeclName := shortDeclName,
-        declName      := declName,
-        binderIds     := binderIds,
-        type          := type,
-        mvar          := mvar,
+        ref           := declId
+        attrs         := attrs
+        shortDeclName := shortDeclName
+        declName      := declName
+        binderIds     := binderIds
+        type          := type
+        mvar          := mvar
         valStx        := valStx
         : LetRecDeclView }
     else
@@ -120,7 +120,7 @@ private def registerLetRecsToLift (views : Array LetRecDeclView) (fvars : Array
   let view ← mkLetRecDeclView stx
   withAuxLocalDecls view.decls fun fvars => do
     for decl in view.decls, fvar in fvars do
-      addTermInfo (isBinder := true) decl.ref[0] fvar
+      addTermInfo (isBinder := true) decl.ref fvar
     let values ← elabLetRecDeclValues view
     let body ← elabTermEnsuringType view.body expectedType?
     registerLetRecsToLift view.decls fvars values
diff --git a/stage0/stdlib/Init/System/IO.c b/stage0/stdlib/Init/System/IO.c
index a42722d88c..a04b5a97e6 100644
--- a/stage0/stdlib/Init/System/IO.c
+++ b/stage0/stdlib/Init/System/IO.c
@@ -89,7 +89,6 @@ LEAN_EXPORT lean_object* l_Lean_instEvalIO___rarg(lean_object*, lean_object*, ui
 static lean_object* l_Lean_instEvalUnit___rarg___closed__1;
 lean_object* lean_st_ref_get(lean_object*, lean_object*);
 LEAN_EXPORT lean_object* l_EIO_toBaseIO(lean_object*, lean_object*);
-static lean_object* l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1___closed__2;
 LEAN_EXPORT lean_object* l_unsafeIO___rarg(lean_object*);
 LEAN_EXPORT lean_object* l_EIO_toIO_x27(lean_object*, lean_object*);
 uint32_t lean_uint32_shift_left(uint32_t, uint32_t);
@@ -138,7 +137,6 @@ LEAN_EXPORT lean_object* l_IO_getRandomBytes___boxed(lean_object*, lean_object*)
 static lean_object* l___private_Init_System_IO_0__IO_FS_reprDirEntry____x40_Init_System_IO___hyg_1886____closed__12;
 lean_object* lean_string_utf8_byte_size(lean_object*);
 LEAN_EXPORT lean_object* l_Lean_instEval(lean_object*);
-static lean_object* l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1___closed__3;
 lean_object* lean_io_process_spawn(lean_object*, lean_object*);
 static uint32_t l_IO_AccessRight_flags___closed__13;
 LEAN_EXPORT lean_object* l_BaseIO_bindTask___boxed(lean_object*, lean_object*, lean_object*, lean_object*, lean_object*, lean_object*);
@@ -154,7 +152,7 @@ static lean_object* l_Lean_instEvalUnit___rarg___closed__2;
 static lean_object* l___private_Init_System_IO_0__IO_FS_reprFileType____x40_Init_System_IO___hyg_1941____closed__13;
 lean_object* lean_get_set_stdout(lean_object*, lean_object*);
 static lean_object* l___private_Init_System_IO_0__IO_FS_reprMetadata____x40_Init_System_IO___hyg_2354____closed__1;
-LEAN_EXPORT lean_object* l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1(lean_object*, lean_object*, lean_object*, lean_object*, size_t, size_t, lean_object*, lean_object*, lean_object*);
+LEAN_EXPORT lean_object* l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1(lean_object*, lean_object*, lean_object*, size_t, size_t, lean_object*, lean_object*, lean_object*);
 LEAN_EXPORT lean_object* l_IO_withStdin(lean_object*, lean_object*);
 static lean_object* l___aux__Init__System__IO______macroRules__termPrintln_x21______1___closed__35;
 LEAN_EXPORT lean_object* l_IO_mapTask(lean_object*, lean_object*);
@@ -227,7 +225,7 @@ lean_object* lean_io_read_dir(lean_object*, lean_object*);
 static lean_object* l___aux__Init__System__IO______macroRules__termPrintln_x21______1___closed__10;
 static lean_object* l___aux__Init__System__IO______macroRules__termPrintln_x21______1___closed__32;
 static lean_object* l_IO_FS_instInhabitedStream___closed__3;
-LEAN_EXPORT lean_object* l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1___boxed(lean_object*, lean_object*, lean_object*, lean_object*, lean_object*, lean_object*, lean_object*, lean_object*, lean_object*);
+LEAN_EXPORT lean_object* l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1___boxed(lean_object*, lean_object*, lean_object*, lean_object*, lean_object*, lean_object*, lean_object*, lean_object*);
 static uint32_t l_IO_AccessRight_flags___closed__4;
 static lean_object* l___private_Init_System_IO_0__IO_FS_reprFileType____x40_Init_System_IO___hyg_1941____closed__24;
 static lean_object* l_IO_FS_instInhabitedSystemTime___closed__2;
@@ -471,7 +469,6 @@ static lean_object* l___aux__Init__System__IO______macroRules__termPrintln_x21__
 LEAN_EXPORT lean_object* l_IO_FS_Mode_noConfusion___rarg___lambda__1___boxed(lean_object*);
 static lean_object* l___aux__Init__System__IO______macroRules__termPrintln_x21______1___closed__40;
 LEAN_EXPORT lean_object* l_IO_FS_instLESystemTime;
-static lean_object* l_System_FilePath_walkDir_go___lambda__1___closed__1;
 LEAN_EXPORT lean_object* l_IO_FileRight_group___default;
 lean_object* lean_st_ref_set(lean_object*, lean_object*, lean_object*);
 static lean_object* l___private_Init_System_IO_0__IO_FS_reprSystemTime____x40_Init_System_IO___hyg_2117____closed__2;
@@ -4824,460 +4821,365 @@ lean_ctor_set(x_2, 0, x_1);
 return x_2;
 }
 }
-static lean_object* _init_l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1___closed__2() {
+LEAN_EXPORT lean_object* l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1(lean_object* x_1, lean_object* x_2, lean_object* x_3, size_t x_4, size_t x_5, lean_object* x_6, lean_object* x_7, lean_object* x_8) {
 _start:
 {
-lean_object* x_1; lean_object* x_2; lean_object* x_3; 
-x_1 = l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1___closed__1;
-x_2 = lean_box(0);
-x_3 = lean_alloc_ctor(0, 2, 0);
-lean_ctor_set(x_3, 0, x_1);
-lean_ctor_set(x_3, 1, x_2);
-return x_3;
-}
-}
-static lean_object* _init_l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1___closed__3() {
-_start:
+lean_object* x_9; lean_object* x_10; uint8_t x_18; 
+x_18 = lean_usize_dec_lt(x_5, x_4);
+if (x_18 == 0)
 {
-lean_object* x_1; lean_object* x_2; 
-x_1 = l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1___closed__2;
-x_2 = lean_alloc_ctor(0, 1, 0);
-lean_ctor_set(x_2, 0, x_1);
-return x_2;
-}
-}
-LEAN_EXPORT lean_object* l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1(lean_object* x_1, lean_object* x_2, lean_object* x_3, lean_object* x_4, size_t x_5, size_t x_6, lean_object* x_7, lean_object* x_8, lean_object* x_9) {
-_start:
-{
-lean_object* x_10; lean_object* x_11; uint8_t x_27; 
-x_27 = lean_usize_dec_lt(x_6, x_5);
-if (x_27 == 0)
-{
-lean_object* x_28; lean_object* x_29; 
-lean_dec(x_3);
+lean_object* x_19; lean_object* x_20; 
 lean_dec(x_2);
 lean_dec(x_1);
-x_28 = lean_alloc_ctor(0, 2, 0);
-lean_ctor_set(x_28, 0, x_7);
-lean_ctor_set(x_28, 1, x_8);
-x_29 = lean_alloc_ctor(0, 2, 0);
-lean_ctor_set(x_29, 0, x_28);
-lean_ctor_set(x_29, 1, x_9);
+x_19 = lean_alloc_ctor(0, 2, 0);
+lean_ctor_set(x_19, 0, x_6);
+lean_ctor_set(x_19, 1, x_7);
+x_20 = lean_alloc_ctor(0, 2, 0);
+lean_ctor_set(x_20, 0, x_19);
+lean_ctor_set(x_20, 1, x_8);
+return x_20;
+}
+else
+{
+lean_object* x_21; lean_object* x_22; lean_object* x_23; lean_object* x_24; 
+lean_dec(x_6);
+x_21 = lean_array_uget(x_3, x_5);
+x_22 = l_IO_FS_DirEntry_path(x_21);
+lean_inc(x_22);
+x_23 = lean_array_push(x_7, x_22);
+x_24 = lean_io_metadata(x_22, x_8);
+if (lean_obj_tag(x_24) == 0)
+{
+lean_object* x_25; uint8_t x_26; lean_object* x_27; 
+x_25 = lean_ctor_get(x_24, 0);
+lean_inc(x_25);
+x_26 = lean_ctor_get_uint8(x_25, sizeof(void*)*2 + 8);
+lean_dec(x_25);
+x_27 = lean_box(x_26);
+switch (lean_obj_tag(x_27)) {
+case 0:
+{
+lean_object* x_28; lean_object* x_29; 
+x_28 = lean_ctor_get(x_24, 1);
+lean_inc(x_28);
+lean_dec(x_24);
+lean_inc(x_1);
+x_29 = l_System_FilePath_walkDir_go(x_1, x_22, x_23, x_28);
+if (lean_obj_tag(x_29) == 0)
+{
+lean_object* x_30; lean_object* x_31; uint8_t x_32; 
+x_30 = lean_ctor_get(x_29, 0);
+lean_inc(x_30);
+x_31 = lean_ctor_get(x_29, 1);
+lean_inc(x_31);
+lean_dec(x_29);
+x_32 = !lean_is_exclusive(x_30);
+if (x_32 == 0)
+{
+lean_object* x_33; lean_object* x_34; 
+x_33 = lean_ctor_get(x_30, 0);
+lean_dec(x_33);
+x_34 = l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1___closed__1;
+lean_ctor_set(x_30, 0, x_34);
+x_9 = x_30;
+x_10 = x_31;
+goto block_17;
+}
+else
+{
+lean_object* x_35; lean_object* x_36; lean_object* x_37; 
+x_35 = lean_ctor_get(x_30, 1);
+lean_inc(x_35);
+lean_dec(x_30);
+x_36 = l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1___closed__1;
+x_37 = lean_alloc_ctor(0, 2, 0);
+lean_ctor_set(x_37, 0, x_36);
+lean_ctor_set(x_37, 1, x_35);
+x_9 = x_37;
+x_10 = x_31;
+goto block_17;
+}
+}
+else
+{
+uint8_t x_38; 
+lean_dec(x_2);
+lean_dec(x_1);
+x_38 = !lean_is_exclusive(x_29);
+if (x_38 == 0)
+{
 return x_29;
 }
 else
 {
-lean_object* x_30; lean_object* x_31; lean_object* x_32; lean_object* x_33; 
-lean_dec(x_7);
-x_30 = lean_array_uget(x_4, x_6);
-x_31 = l_IO_FS_DirEntry_path(x_30);
-lean_inc(x_31);
-x_32 = lean_array_push(x_8, x_31);
-x_33 = lean_io_metadata(x_31, x_9);
-if (lean_obj_tag(x_33) == 0)
-{
-lean_object* x_34; uint8_t x_35; lean_object* x_36; 
-x_34 = lean_ctor_get(x_33, 0);
-lean_inc(x_34);
-x_35 = lean_ctor_get_uint8(x_34, sizeof(void*)*2 + 8);
-lean_dec(x_34);
-x_36 = lean_box(x_35);
-switch (lean_obj_tag(x_36)) {
-case 0:
-{
-lean_object* x_37; lean_object* x_38; 
-x_37 = lean_ctor_get(x_33, 1);
-lean_inc(x_37);
-lean_dec(x_33);
-lean_inc(x_1);
-x_38 = l_System_FilePath_walkDir_go(x_1, x_31, x_32, x_37);
-if (lean_obj_tag(x_38) == 0)
-{
-lean_object* x_39; lean_object* x_40; uint8_t x_41; 
-x_39 = lean_ctor_get(x_38, 0);
-lean_inc(x_39);
-x_40 = lean_ctor_get(x_38, 1);
+lean_object* x_39; lean_object* x_40; lean_object* x_41; 
+x_39 = lean_ctor_get(x_29, 0);
+x_40 = lean_ctor_get(x_29, 1);
 lean_inc(x_40);
-lean_dec(x_38);
-x_41 = !lean_is_exclusive(x_39);
-if (x_41 == 0)
-{
-lean_object* x_42; lean_object* x_43; 
-x_42 = lean_ctor_get(x_39, 0);
-lean_dec(x_42);
-lean_inc(x_3);
-x_43 = lean_alloc_ctor(1, 1, 0);
-lean_ctor_set(x_43, 0, x_3);
-lean_ctor_set(x_39, 0, x_43);
-x_10 = x_39;
-x_11 = x_40;
-goto block_26;
-}
-else
-{
-lean_object* x_44; lean_object* x_45; lean_object* x_46; 
-x_44 = lean_ctor_get(x_39, 1);
-lean_inc(x_44);
-lean_dec(x_39);
-lean_inc(x_3);
-x_45 = lean_alloc_ctor(1, 1, 0);
-lean_ctor_set(x_45, 0, x_3);
-x_46 = lean_alloc_ctor(0, 2, 0);
-lean_ctor_set(x_46, 0, x_45);
-lean_ctor_set(x_46, 1, x_44);
-x_10 = x_46;
-x_11 = x_40;
-goto block_26;
-}
-}
-else
-{
-uint8_t x_47; 
-lean_dec(x_3);
-lean_dec(x_2);
-lean_dec(x_1);
-x_47 = !lean_is_exclusive(x_38);
-if (x_47 == 0)
-{
-return x_38;
-}
-else
-{
-lean_object* x_48; lean_object* x_49; lean_object* x_50; 
-x_48 = lean_ctor_get(x_38, 0);
-x_49 = lean_ctor_get(x_38, 1);
-lean_inc(x_49);
-lean_inc(x_48);
-lean_dec(x_38);
-x_50 = lean_alloc_ctor(1, 2, 0);
-lean_ctor_set(x_50, 0, x_48);
-lean_ctor_set(x_50, 1, x_49);
-return x_50;
+lean_inc(x_39);
+lean_dec(x_29);
+x_41 = lean_alloc_ctor(1, 2, 0);
+lean_ctor_set(x_41, 0, x_39);
+lean_ctor_set(x_41, 1, x_40);
+return x_41;
 }
 }
 }
 case 2:
 {
-lean_object* x_51; lean_object* x_52; 
-x_51 = lean_ctor_get(x_33, 1);
-lean_inc(x_51);
-lean_dec(x_33);
-x_52 = lean_io_realpath(x_31, x_51);
-if (lean_obj_tag(x_52) == 0)
+lean_object* x_42; lean_object* x_43; 
+x_42 = lean_ctor_get(x_24, 1);
+lean_inc(x_42);
+lean_dec(x_24);
+x_43 = lean_io_realpath(x_22, x_42);
+if (lean_obj_tag(x_43) == 0)
 {
-lean_object* x_53; lean_object* x_54; lean_object* x_55; lean_object* x_56; uint8_t x_57; 
-x_53 = lean_ctor_get(x_52, 0);
-lean_inc(x_53);
-x_54 = lean_ctor_get(x_52, 1);
-lean_inc(x_54);
-lean_dec(x_52);
-x_55 = l_System_FilePath_isDir(x_53, x_54);
-x_56 = lean_ctor_get(x_55, 0);
-lean_inc(x_56);
-x_57 = lean_unbox(x_56);
-lean_dec(x_56);
-if (x_57 == 0)
+lean_object* x_44; lean_object* x_45; lean_object* x_46; lean_object* x_47; uint8_t x_48; 
+x_44 = lean_ctor_get(x_43, 0);
+lean_inc(x_44);
+x_45 = lean_ctor_get(x_43, 1);
+lean_inc(x_45);
+lean_dec(x_43);
+x_46 = l_System_FilePath_isDir(x_44, x_45);
+x_47 = lean_ctor_get(x_46, 0);
+lean_inc(x_47);
+x_48 = lean_unbox(x_47);
+lean_dec(x_47);
+if (x_48 == 0)
 {
-lean_object* x_58; lean_object* x_59; lean_object* x_60; 
-lean_dec(x_53);
-x_58 = lean_ctor_get(x_55, 1);
-lean_inc(x_58);
-lean_dec(x_55);
-lean_inc(x_3);
-x_59 = lean_alloc_ctor(1, 1, 0);
-lean_ctor_set(x_59, 0, x_3);
-x_60 = lean_alloc_ctor(0, 2, 0);
-lean_ctor_set(x_60, 0, x_59);
-lean_ctor_set(x_60, 1, x_32);
-x_10 = x_60;
-x_11 = x_58;
-goto block_26;
+lean_object* x_49; lean_object* x_50; lean_object* x_51; 
+lean_dec(x_44);
+x_49 = lean_ctor_get(x_46, 1);
+lean_inc(x_49);
+lean_dec(x_46);
+x_50 = l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1___closed__1;
+x_51 = lean_alloc_ctor(0, 2, 0);
+lean_ctor_set(x_51, 0, x_50);
+lean_ctor_set(x_51, 1, x_23);
+x_9 = x_51;
+x_10 = x_49;
+goto block_17;
 }
 else
 {
-lean_object* x_61; lean_object* x_62; 
-x_61 = lean_ctor_get(x_55, 1);
-lean_inc(x_61);
-lean_dec(x_55);
+lean_object* x_52; lean_object* x_53; 
+x_52 = lean_ctor_get(x_46, 1);
+lean_inc(x_52);
+lean_dec(x_46);
 lean_inc(x_1);
 lean_inc(x_2);
-x_62 = lean_apply_2(x_1, x_2, x_61);
-if (lean_obj_tag(x_62) == 0)
+x_53 = lean_apply_2(x_1, x_2, x_52);
+if (lean_obj_tag(x_53) == 0)
 {
-lean_object* x_63; uint8_t x_64; 
-x_63 = lean_ctor_get(x_62, 0);
-lean_inc(x_63);
-x_64 = lean_unbox(x_63);
-lean_dec(x_63);
-if (x_64 == 0)
+lean_object* x_54; uint8_t x_55; 
+x_54 = lean_ctor_get(x_53, 0);
+lean_inc(x_54);
+x_55 = lean_unbox(x_54);
+lean_dec(x_54);
+if (x_55 == 0)
 {
-lean_object* x_65; lean_object* x_66; lean_object* x_67; 
+lean_object* x_56; lean_object* x_57; lean_object* x_58; 
+lean_dec(x_44);
+x_56 = lean_ctor_get(x_53, 1);
+lean_inc(x_56);
 lean_dec(x_53);
-x_65 = lean_ctor_get(x_62, 1);
-lean_inc(x_65);
-lean_dec(x_62);
-lean_inc(x_3);
-x_66 = lean_alloc_ctor(1, 1, 0);
-lean_ctor_set(x_66, 0, x_3);
-x_67 = lean_alloc_ctor(0, 2, 0);
-lean_ctor_set(x_67, 0, x_66);
-lean_ctor_set(x_67, 1, x_32);
-x_10 = x_67;
-x_11 = x_65;
-goto block_26;
+x_57 = l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1___closed__1;
+x_58 = lean_alloc_ctor(0, 2, 0);
+lean_ctor_set(x_58, 0, x_57);
+lean_ctor_set(x_58, 1, x_23);
+x_9 = x_58;
+x_10 = x_56;
+goto block_17;
 }
 else
 {
-lean_object* x_68; lean_object* x_69; 
-x_68 = lean_ctor_get(x_62, 1);
-lean_inc(x_68);
-lean_dec(x_62);
+lean_object* x_59; lean_object* x_60; 
+x_59 = lean_ctor_get(x_53, 1);
+lean_inc(x_59);
+lean_dec(x_53);
 lean_inc(x_1);
-x_69 = l_System_FilePath_walkDir_go(x_1, x_53, x_32, x_68);
-if (lean_obj_tag(x_69) == 0)
+x_60 = l_System_FilePath_walkDir_go(x_1, x_44, x_23, x_59);
+if (lean_obj_tag(x_60) == 0)
 {
-lean_object* x_70; lean_object* x_71; uint8_t x_72; 
-x_70 = lean_ctor_get(x_69, 0);
-lean_inc(x_70);
-x_71 = lean_ctor_get(x_69, 1);
+lean_object* x_61; lean_object* x_62; uint8_t x_63; 
+x_61 = lean_ctor_get(x_60, 0);
+lean_inc(x_61);
+x_62 = lean_ctor_get(x_60, 1);
+lean_inc(x_62);
+lean_dec(x_60);
+x_63 = !lean_is_exclusive(x_61);
+if (x_63 == 0)
+{
+lean_object* x_64; lean_object* x_65; 
+x_64 = lean_ctor_get(x_61, 0);
+lean_dec(x_64);
+x_65 = l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1___closed__1;
+lean_ctor_set(x_61, 0, x_65);
+x_9 = x_61;
+x_10 = x_62;
+goto block_17;
+}
+else
+{
+lean_object* x_66; lean_object* x_67; lean_object* x_68; 
+x_66 = lean_ctor_get(x_61, 1);
+lean_inc(x_66);
+lean_dec(x_61);
+x_67 = l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1___closed__1;
+x_68 = lean_alloc_ctor(0, 2, 0);
+lean_ctor_set(x_68, 0, x_67);
+lean_ctor_set(x_68, 1, x_66);
+x_9 = x_68;
+x_10 = x_62;
+goto block_17;
+}
+}
+else
+{
+uint8_t x_69; 
+lean_dec(x_2);
+lean_dec(x_1);
+x_69 = !lean_is_exclusive(x_60);
+if (x_69 == 0)
+{
+return x_60;
+}
+else
+{
+lean_object* x_70; lean_object* x_71; lean_object* x_72; 
+x_70 = lean_ctor_get(x_60, 0);
+x_71 = lean_ctor_get(x_60, 1);
 lean_inc(x_71);
-lean_dec(x_69);
-x_72 = !lean_is_exclusive(x_70);
-if (x_72 == 0)
-{
-lean_object* x_73; lean_object* x_74; 
-x_73 = lean_ctor_get(x_70, 0);
-lean_dec(x_73);
-lean_inc(x_3);
-x_74 = lean_alloc_ctor(1, 1, 0);
-lean_ctor_set(x_74, 0, x_3);
-lean_ctor_set(x_70, 0, x_74);
-x_10 = x_70;
-x_11 = x_71;
-goto block_26;
+lean_inc(x_70);
+lean_dec(x_60);
+x_72 = lean_alloc_ctor(1, 2, 0);
+lean_ctor_set(x_72, 0, x_70);
+lean_ctor_set(x_72, 1, x_71);
+return x_72;
+}
+}
+}
 }
 else
 {
-lean_object* x_75; lean_object* x_76; lean_object* x_77; 
-x_75 = lean_ctor_get(x_70, 1);
+uint8_t x_73; 
+lean_dec(x_44);
+lean_dec(x_23);
+lean_dec(x_2);
+lean_dec(x_1);
+x_73 = !lean_is_exclusive(x_53);
+if (x_73 == 0)
+{
+return x_53;
+}
+else
+{
+lean_object* x_74; lean_object* x_75; lean_object* x_76; 
+x_74 = lean_ctor_get(x_53, 0);
+x_75 = lean_ctor_get(x_53, 1);
 lean_inc(x_75);
-lean_dec(x_70);
-lean_inc(x_3);
-x_76 = lean_alloc_ctor(1, 1, 0);
-lean_ctor_set(x_76, 0, x_3);
-x_77 = lean_alloc_ctor(0, 2, 0);
-lean_ctor_set(x_77, 0, x_76);
-lean_ctor_set(x_77, 1, x_75);
-x_10 = x_77;
-x_11 = x_71;
-goto block_26;
-}
-}
-else
-{
-uint8_t x_78; 
-lean_dec(x_3);
-lean_dec(x_2);
-lean_dec(x_1);
-x_78 = !lean_is_exclusive(x_69);
-if (x_78 == 0)
-{
-return x_69;
-}
-else
-{
-lean_object* x_79; lean_object* x_80; lean_object* x_81; 
-x_79 = lean_ctor_get(x_69, 0);
-x_80 = lean_ctor_get(x_69, 1);
-lean_inc(x_80);
-lean_inc(x_79);
-lean_dec(x_69);
-x_81 = lean_alloc_ctor(1, 2, 0);
-lean_ctor_set(x_81, 0, x_79);
-lean_ctor_set(x_81, 1, x_80);
-return x_81;
-}
-}
-}
-}
-else
-{
-uint8_t x_82; 
+lean_inc(x_74);
 lean_dec(x_53);
-lean_dec(x_32);
-lean_dec(x_3);
+x_76 = lean_alloc_ctor(1, 2, 0);
+lean_ctor_set(x_76, 0, x_74);
+lean_ctor_set(x_76, 1, x_75);
+return x_76;
+}
+}
+}
+}
+else
+{
+uint8_t x_77; 
+lean_dec(x_23);
 lean_dec(x_2);
 lean_dec(x_1);
-x_82 = !lean_is_exclusive(x_62);
-if (x_82 == 0)
+x_77 = !lean_is_exclusive(x_43);
+if (x_77 == 0)
 {
-return x_62;
+return x_43;
 }
 else
 {
-lean_object* x_83; lean_object* x_84; lean_object* x_85; 
-x_83 = lean_ctor_get(x_62, 0);
-x_84 = lean_ctor_get(x_62, 1);
-lean_inc(x_84);
-lean_inc(x_83);
-lean_dec(x_62);
-x_85 = lean_alloc_ctor(1, 2, 0);
-lean_ctor_set(x_85, 0, x_83);
-lean_ctor_set(x_85, 1, x_84);
-return x_85;
-}
-}
-}
-}
-else
-{
-uint8_t x_86; 
-lean_dec(x_32);
-lean_dec(x_3);
-lean_dec(x_2);
-lean_dec(x_1);
-x_86 = !lean_is_exclusive(x_52);
-if (x_86 == 0)
-{
-return x_52;
-}
-else
-{
-lean_object* x_87; lean_object* x_88; lean_object* x_89; 
-x_87 = lean_ctor_get(x_52, 0);
-x_88 = lean_ctor_get(x_52, 1);
-lean_inc(x_88);
-lean_inc(x_87);
-lean_dec(x_52);
-x_89 = lean_alloc_ctor(1, 2, 0);
-lean_ctor_set(x_89, 0, x_87);
-lean_ctor_set(x_89, 1, x_88);
-return x_89;
+lean_object* x_78; lean_object* x_79; lean_object* x_80; 
+x_78 = lean_ctor_get(x_43, 0);
+x_79 = lean_ctor_get(x_43, 1);
+lean_inc(x_79);
+lean_inc(x_78);
+lean_dec(x_43);
+x_80 = lean_alloc_ctor(1, 2, 0);
+lean_ctor_set(x_80, 0, x_78);
+lean_ctor_set(x_80, 1, x_79);
+return x_80;
 }
 }
 }
 default: 
 {
-lean_object* x_90; lean_object* x_91; lean_object* x_92; 
-lean_dec(x_36);
-lean_dec(x_31);
-x_90 = lean_ctor_get(x_33, 1);
-lean_inc(x_90);
-lean_dec(x_33);
-x_91 = l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1___closed__3;
-x_92 = lean_alloc_ctor(0, 2, 0);
-lean_ctor_set(x_92, 0, x_91);
-lean_ctor_set(x_92, 1, x_32);
-x_10 = x_92;
-x_11 = x_90;
-goto block_26;
+lean_object* x_81; lean_object* x_82; lean_object* x_83; 
+lean_dec(x_27);
+lean_dec(x_22);
+x_81 = lean_ctor_get(x_24, 1);
+lean_inc(x_81);
+lean_dec(x_24);
+x_82 = l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1___closed__1;
+x_83 = lean_alloc_ctor(0, 2, 0);
+lean_ctor_set(x_83, 0, x_82);
+lean_ctor_set(x_83, 1, x_23);
+x_9 = x_83;
+x_10 = x_81;
+goto block_17;
 }
 }
 }
 else
 {
-uint8_t x_93; 
-lean_dec(x_32);
-lean_dec(x_31);
-lean_dec(x_3);
+uint8_t x_84; 
+lean_dec(x_23);
+lean_dec(x_22);
 lean_dec(x_2);
 lean_dec(x_1);
-x_93 = !lean_is_exclusive(x_33);
-if (x_93 == 0)
+x_84 = !lean_is_exclusive(x_24);
+if (x_84 == 0)
 {
-return x_33;
+return x_24;
 }
 else
 {
-lean_object* x_94; lean_object* x_95; lean_object* x_96; 
-x_94 = lean_ctor_get(x_33, 0);
-x_95 = lean_ctor_get(x_33, 1);
-lean_inc(x_95);
-lean_inc(x_94);
-lean_dec(x_33);
-x_96 = lean_alloc_ctor(1, 2, 0);
-lean_ctor_set(x_96, 0, x_94);
-lean_ctor_set(x_96, 1, x_95);
-return x_96;
+lean_object* x_85; lean_object* x_86; lean_object* x_87; 
+x_85 = lean_ctor_get(x_24, 0);
+x_86 = lean_ctor_get(x_24, 1);
+lean_inc(x_86);
+lean_inc(x_85);
+lean_dec(x_24);
+x_87 = lean_alloc_ctor(1, 2, 0);
+lean_ctor_set(x_87, 0, x_85);
+lean_ctor_set(x_87, 1, x_86);
+return x_87;
 }
 }
 }
-block_26:
+block_17:
 {
-lean_object* x_12; 
-x_12 = lean_ctor_get(x_10, 0);
+lean_object* x_11; lean_object* x_12; lean_object* x_13; size_t x_14; size_t x_15; 
+x_11 = lean_ctor_get(x_9, 0);
+lean_inc(x_11);
+x_12 = lean_ctor_get(x_9, 1);
 lean_inc(x_12);
-if (lean_obj_tag(x_12) == 0)
-{
-uint8_t x_13; 
-lean_dec(x_3);
-lean_dec(x_2);
-lean_dec(x_1);
-x_13 = !lean_is_exclusive(x_10);
-if (x_13 == 0)
-{
-lean_object* x_14; lean_object* x_15; lean_object* x_16; 
-x_14 = lean_ctor_get(x_10, 0);
-lean_dec(x_14);
-x_15 = lean_ctor_get(x_12, 0);
-lean_inc(x_15);
-lean_dec(x_12);
-lean_ctor_set(x_10, 0, x_15);
-x_16 = lean_alloc_ctor(0, 2, 0);
-lean_ctor_set(x_16, 0, x_10);
-lean_ctor_set(x_16, 1, x_11);
-return x_16;
-}
-else
-{
-lean_object* x_17; lean_object* x_18; lean_object* x_19; lean_object* x_20; 
-x_17 = lean_ctor_get(x_10, 1);
-lean_inc(x_17);
-lean_dec(x_10);
-x_18 = lean_ctor_get(x_12, 0);
-lean_inc(x_18);
-lean_dec(x_12);
-x_19 = lean_alloc_ctor(0, 2, 0);
-lean_ctor_set(x_19, 0, x_18);
-lean_ctor_set(x_19, 1, x_17);
-x_20 = lean_alloc_ctor(0, 2, 0);
-lean_ctor_set(x_20, 0, x_19);
-lean_ctor_set(x_20, 1, x_11);
-return x_20;
-}
-}
-else
-{
-lean_object* x_21; lean_object* x_22; size_t x_23; size_t x_24; 
-x_21 = lean_ctor_get(x_10, 1);
-lean_inc(x_21);
-lean_dec(x_10);
-x_22 = lean_ctor_get(x_12, 0);
-lean_inc(x_22);
-lean_dec(x_12);
-x_23 = 1;
-x_24 = lean_usize_add(x_6, x_23);
-x_6 = x_24;
-x_7 = x_22;
-x_8 = x_21;
-x_9 = x_11;
+lean_dec(x_9);
+x_13 = lean_ctor_get(x_11, 0);
+lean_inc(x_13);
+lean_dec(x_11);
+x_14 = 1;
+x_15 = lean_usize_add(x_5, x_14);
+x_5 = x_15;
+x_6 = x_13;
+x_7 = x_12;
+x_8 = x_10;
 goto _start;
 }
 }
 }
-}
-static lean_object* _init_l_System_FilePath_walkDir_go___lambda__1___closed__1() {
-_start:
-{
-lean_object* x_1; lean_object* x_2; lean_object* x_3; 
-x_1 = lean_box(0);
-x_2 = lean_box(0);
-x_3 = lean_alloc_ctor(0, 2, 0);
-lean_ctor_set(x_3, 0, x_1);
-lean_ctor_set(x_3, 1, x_2);
-return x_3;
-}
-}
 LEAN_EXPORT lean_object* l_System_FilePath_walkDir_go___lambda__1(lean_object* x_1, lean_object* x_2, lean_object* x_3, lean_object* x_4, lean_object* x_5) {
 _start:
 {
@@ -5295,198 +5197,116 @@ x_9 = lean_array_get_size(x_7);
 x_10 = lean_usize_of_nat(x_9);
 lean_dec(x_9);
 x_11 = 0;
-x_12 = l_System_FilePath_walkDir_go___lambda__1___closed__1;
-x_13 = l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1(x_2, x_1, x_12, x_7, x_10, x_11, x_12, x_4, x_8);
+x_12 = lean_box(0);
+x_13 = l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1(x_2, x_1, x_7, x_10, x_11, x_12, x_4, x_8);
 lean_dec(x_7);
 if (lean_obj_tag(x_13) == 0)
 {
-lean_object* x_14; lean_object* x_15; lean_object* x_16; 
-x_14 = lean_ctor_get(x_13, 0);
-lean_inc(x_14);
-x_15 = lean_ctor_get(x_14, 0);
-lean_inc(x_15);
-x_16 = lean_ctor_get(x_15, 0);
-lean_inc(x_16);
+uint8_t x_14; 
+x_14 = !lean_is_exclusive(x_13);
+if (x_14 == 0)
+{
+lean_object* x_15; uint8_t x_16; 
+x_15 = lean_ctor_get(x_13, 0);
+x_16 = !lean_is_exclusive(x_15);
+if (x_16 == 0)
+{
+lean_object* x_17; 
+x_17 = lean_ctor_get(x_15, 0);
+lean_dec(x_17);
+lean_ctor_set(x_15, 0, x_12);
+return x_13;
+}
+else
+{
+lean_object* x_18; lean_object* x_19; 
+x_18 = lean_ctor_get(x_15, 1);
+lean_inc(x_18);
 lean_dec(x_15);
-if (lean_obj_tag(x_16) == 0)
-{
-uint8_t x_17; 
-x_17 = !lean_is_exclusive(x_13);
-if (x_17 == 0)
-{
-lean_object* x_18; uint8_t x_19; 
-x_18 = lean_ctor_get(x_13, 0);
-lean_dec(x_18);
-x_19 = !lean_is_exclusive(x_14);
-if (x_19 == 0)
-{
-lean_object* x_20; lean_object* x_21; 
-x_20 = lean_ctor_get(x_14, 0);
-lean_dec(x_20);
-x_21 = lean_box(0);
-lean_ctor_set(x_14, 0, x_21);
+x_19 = lean_alloc_ctor(0, 2, 0);
+lean_ctor_set(x_19, 0, x_12);
+lean_ctor_set(x_19, 1, x_18);
+lean_ctor_set(x_13, 0, x_19);
 return x_13;
 }
+}
 else
 {
-lean_object* x_22; lean_object* x_23; lean_object* x_24; 
-x_22 = lean_ctor_get(x_14, 1);
+lean_object* x_20; lean_object* x_21; lean_object* x_22; lean_object* x_23; lean_object* x_24; lean_object* x_25; 
+x_20 = lean_ctor_get(x_13, 0);
+x_21 = lean_ctor_get(x_13, 1);
+lean_inc(x_21);
+lean_inc(x_20);
+lean_dec(x_13);
+x_22 = lean_ctor_get(x_20, 1);
 lean_inc(x_22);
-lean_dec(x_14);
-x_23 = lean_box(0);
-x_24 = lean_alloc_ctor(0, 2, 0);
-lean_ctor_set(x_24, 0, x_23);
+if (lean_is_exclusive(x_20)) {
+ lean_ctor_release(x_20, 0);
+ lean_ctor_release(x_20, 1);
+ x_23 = x_20;
+} else {
+ lean_dec_ref(x_20);
+ x_23 = lean_box(0);
+}
+if (lean_is_scalar(x_23)) {
+ x_24 = lean_alloc_ctor(0, 2, 0);
+} else {
+ x_24 = x_23;
+}
+lean_ctor_set(x_24, 0, x_12);
 lean_ctor_set(x_24, 1, x_22);
-lean_ctor_set(x_13, 0, x_24);
-return x_13;
+x_25 = lean_alloc_ctor(0, 2, 0);
+lean_ctor_set(x_25, 0, x_24);
+lean_ctor_set(x_25, 1, x_21);
+return x_25;
 }
 }
 else
 {
-lean_object* x_25; lean_object* x_26; lean_object* x_27; lean_object* x_28; lean_object* x_29; lean_object* x_30; 
-x_25 = lean_ctor_get(x_13, 1);
-lean_inc(x_25);
+uint8_t x_26; 
+x_26 = !lean_is_exclusive(x_13);
+if (x_26 == 0)
+{
+return x_13;
+}
+else
+{
+lean_object* x_27; lean_object* x_28; lean_object* x_29; 
+x_27 = lean_ctor_get(x_13, 0);
+x_28 = lean_ctor_get(x_13, 1);
+lean_inc(x_28);
+lean_inc(x_27);
 lean_dec(x_13);
-x_26 = lean_ctor_get(x_14, 1);
-lean_inc(x_26);
-if (lean_is_exclusive(x_14)) {
- lean_ctor_release(x_14, 0);
- lean_ctor_release(x_14, 1);
- x_27 = x_14;
-} else {
- lean_dec_ref(x_14);
- x_27 = lean_box(0);
-}
-x_28 = lean_box(0);
-if (lean_is_scalar(x_27)) {
- x_29 = lean_alloc_ctor(0, 2, 0);
-} else {
- x_29 = x_27;
-}
-lean_ctor_set(x_29, 0, x_28);
-lean_ctor_set(x_29, 1, x_26);
-x_30 = lean_alloc_ctor(0, 2, 0);
-lean_ctor_set(x_30, 0, x_29);
-lean_ctor_set(x_30, 1, x_25);
-return x_30;
-}
-}
-else
-{
-uint8_t x_31; 
-x_31 = !lean_is_exclusive(x_13);
-if (x_31 == 0)
-{
-lean_object* x_32; uint8_t x_33; 
-x_32 = lean_ctor_get(x_13, 0);
-lean_dec(x_32);
-x_33 = !lean_is_exclusive(x_14);
-if (x_33 == 0)
-{
-lean_object* x_34; lean_object* x_35; 
-x_34 = lean_ctor_get(x_14, 0);
-lean_dec(x_34);
-x_35 = lean_ctor_get(x_16, 0);
-lean_inc(x_35);
-lean_dec(x_16);
-lean_ctor_set(x_14, 0, x_35);
-return x_13;
-}
-else
-{
-lean_object* x_36; lean_object* x_37; lean_object* x_38; 
-x_36 = lean_ctor_get(x_14, 1);
-lean_inc(x_36);
-lean_dec(x_14);
-x_37 = lean_ctor_get(x_16, 0);
-lean_inc(x_37);
-lean_dec(x_16);
-x_38 = lean_alloc_ctor(0, 2, 0);
-lean_ctor_set(x_38, 0, x_37);
-lean_ctor_set(x_38, 1, x_36);
-lean_ctor_set(x_13, 0, x_38);
-return x_13;
-}
-}
-else
-{
-lean_object* x_39; lean_object* x_40; lean_object* x_41; lean_object* x_42; lean_object* x_43; lean_object* x_44; 
-x_39 = lean_ctor_get(x_13, 1);
-lean_inc(x_39);
-lean_dec(x_13);
-x_40 = lean_ctor_get(x_14, 1);
-lean_inc(x_40);
-if (lean_is_exclusive(x_14)) {
- lean_ctor_release(x_14, 0);
- lean_ctor_release(x_14, 1);
- x_41 = x_14;
-} else {
- lean_dec_ref(x_14);
- x_41 = lean_box(0);
-}
-x_42 = lean_ctor_get(x_16, 0);
-lean_inc(x_42);
-lean_dec(x_16);
-if (lean_is_scalar(x_41)) {
- x_43 = lean_alloc_ctor(0, 2, 0);
-} else {
- x_43 = x_41;
-}
-lean_ctor_set(x_43, 0, x_42);
-lean_ctor_set(x_43, 1, x_40);
-x_44 = lean_alloc_ctor(0, 2, 0);
-lean_ctor_set(x_44, 0, x_43);
-lean_ctor_set(x_44, 1, x_39);
-return x_44;
+x_29 = lean_alloc_ctor(1, 2, 0);
+lean_ctor_set(x_29, 0, x_27);
+lean_ctor_set(x_29, 1, x_28);
+return x_29;
 }
 }
 }
 else
 {
-uint8_t x_45; 
-x_45 = !lean_is_exclusive(x_13);
-if (x_45 == 0)
-{
-return x_13;
-}
-else
-{
-lean_object* x_46; lean_object* x_47; lean_object* x_48; 
-x_46 = lean_ctor_get(x_13, 0);
-x_47 = lean_ctor_get(x_13, 1);
-lean_inc(x_47);
-lean_inc(x_46);
-lean_dec(x_13);
-x_48 = lean_alloc_ctor(1, 2, 0);
-lean_ctor_set(x_48, 0, x_46);
-lean_ctor_set(x_48, 1, x_47);
-return x_48;
-}
-}
-}
-else
-{
-uint8_t x_49; 
+uint8_t x_30; 
 lean_dec(x_4);
 lean_dec(x_2);
 lean_dec(x_1);
-x_49 = !lean_is_exclusive(x_6);
-if (x_49 == 0)
+x_30 = !lean_is_exclusive(x_6);
+if (x_30 == 0)
 {
 return x_6;
 }
 else
 {
-lean_object* x_50; lean_object* x_51; lean_object* x_52; 
-x_50 = lean_ctor_get(x_6, 0);
-x_51 = lean_ctor_get(x_6, 1);
-lean_inc(x_51);
-lean_inc(x_50);
+lean_object* x_31; lean_object* x_32; lean_object* x_33; 
+x_31 = lean_ctor_get(x_6, 0);
+x_32 = lean_ctor_get(x_6, 1);
+lean_inc(x_32);
+lean_inc(x_31);
 lean_dec(x_6);
-x_52 = lean_alloc_ctor(1, 2, 0);
-lean_ctor_set(x_52, 0, x_50);
-lean_ctor_set(x_52, 1, x_51);
-return x_52;
+x_33 = lean_alloc_ctor(1, 2, 0);
+lean_ctor_set(x_33, 0, x_31);
+lean_ctor_set(x_33, 1, x_32);
+return x_33;
 }
 }
 }
@@ -5577,17 +5397,17 @@ return x_22;
 }
 }
 }
-LEAN_EXPORT lean_object* l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1___boxed(lean_object* x_1, lean_object* x_2, lean_object* x_3, lean_object* x_4, lean_object* x_5, lean_object* x_6, lean_object* x_7, lean_object* x_8, lean_object* x_9) {
+LEAN_EXPORT lean_object* l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1___boxed(lean_object* x_1, lean_object* x_2, lean_object* x_3, lean_object* x_4, lean_object* x_5, lean_object* x_6, lean_object* x_7, lean_object* x_8) {
 _start:
 {
-size_t x_10; size_t x_11; lean_object* x_12; 
+size_t x_9; size_t x_10; lean_object* x_11; 
+x_9 = lean_unbox_usize(x_4);
+lean_dec(x_4);
 x_10 = lean_unbox_usize(x_5);
 lean_dec(x_5);
-x_11 = lean_unbox_usize(x_6);
-lean_dec(x_6);
-x_12 = l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1(x_1, x_2, x_3, x_4, x_10, x_11, x_7, x_8, x_9);
-lean_dec(x_4);
-return x_12;
+x_11 = l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1(x_1, x_2, x_3, x_9, x_10, x_6, x_7, x_8);
+lean_dec(x_3);
+return x_11;
 }
 }
 LEAN_EXPORT lean_object* l_System_FilePath_walkDir_go___lambda__1___boxed(lean_object* x_1, lean_object* x_2, lean_object* x_3, lean_object* x_4, lean_object* x_5) {
@@ -10945,12 +10765,6 @@ l_IO_FS_instReprMetadata = _init_l_IO_FS_instReprMetadata();
 lean_mark_persistent(l_IO_FS_instReprMetadata);
 l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1___closed__1 = _init_l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1___closed__1();
 lean_mark_persistent(l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1___closed__1);
-l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1___closed__2 = _init_l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1___closed__2();
-lean_mark_persistent(l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1___closed__2);
-l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1___closed__3 = _init_l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1___closed__3();
-lean_mark_persistent(l_Array_forInUnsafe_loop___at_System_FilePath_walkDir_go___spec__1___closed__3);
-l_System_FilePath_walkDir_go___lambda__1___closed__1 = _init_l_System_FilePath_walkDir_go___lambda__1___closed__1();
-lean_mark_persistent(l_System_FilePath_walkDir_go___lambda__1___closed__1);
 l_IO_withStdin___rarg___lambda__3___closed__1 = _init_l_IO_withStdin___rarg___lambda__3___closed__1();
 lean_mark_persistent(l_IO_withStdin___rarg___lambda__3___closed__1);
 l_IO_appDir___closed__1 = _init_l_IO_appDir___closed__1();
diff --git a/stage0/stdlib/Lean/Elab/LetRec.c b/stage0/stdlib/Lean/Elab/LetRec.c
index ed2bafe810..17a44b5643 100644
--- a/stage0/stdlib/Lean/Elab/LetRec.c
+++ b/stage0/stdlib/Lean/Elab/LetRec.c
@@ -2573,6 +2573,7 @@ x_37 = l_Lean_Syntax_getArg(x_14, x_36);
 x_38 = l_Lean_Syntax_getArgs(x_37);
 lean_dec(x_37);
 x_39 = l_Lean_Syntax_getArg(x_14, x_11);
+lean_inc(x_20);
 x_40 = l_Lean_Elab_Term_expandOptType(x_20, x_39);
 lean_dec(x_39);
 x_41 = lean_alloc_closure((void*)(l_Array_mapMUnsafe_map___at___private_Lean_Elab_LetRec_0__Lean_Elab_Term_mkLetRecDeclView___spec__20___lambda__1___boxed), 9, 1);
@@ -2616,7 +2617,6 @@ x_53 = lean_unsigned_to_nat(3u);
 x_54 = l_Lean_Syntax_getArg(x_14, x_53);
 x_55 = 0;
 x_56 = lean_box(x_55);
-lean_inc(x_14);
 x_57 = lean_alloc_closure((void*)(l_Lean_Elab_Term_expandMatchAltsIntoMatch___boxed), 5, 3);
 lean_closure_set(x_57, 0, x_14);
 lean_closure_set(x_57, 1, x_54);
@@ -2636,7 +2636,7 @@ lean_inc(x_59);
 x_60 = lean_ctor_get(x_58, 1);
 lean_inc(x_60);
 lean_dec(x_58);
-x_61 = l_Array_mapMUnsafe_map___at___private_Lean_Elab_LetRec_0__Lean_Elab_Term_mkLetRecDeclView___spec__20___lambda__2(x_14, x_3, x_21, x_26, x_46, x_45, x_51, x_59, x_4, x_5, x_6, x_7, x_8, x_9, x_60);
+x_61 = l_Array_mapMUnsafe_map___at___private_Lean_Elab_LetRec_0__Lean_Elab_Term_mkLetRecDeclView___spec__20___lambda__2(x_20, x_3, x_21, x_26, x_46, x_45, x_51, x_59, x_4, x_5, x_6, x_7, x_8, x_9, x_60);
 lean_dec(x_9);
 lean_dec(x_8);
 lean_dec(x_7);
@@ -2653,7 +2653,7 @@ lean_dec(x_46);
 lean_dec(x_45);
 lean_dec(x_26);
 lean_dec(x_21);
-lean_dec(x_14);
+lean_dec(x_20);
 lean_dec(x_9);
 lean_dec(x_8);
 lean_dec(x_7);
@@ -2691,7 +2691,8 @@ lean_inc(x_67);
 lean_dec(x_50);
 x_68 = lean_unsigned_to_nat(4u);
 x_69 = l_Lean_Syntax_getArg(x_14, x_68);
-x_70 = l_Array_mapMUnsafe_map___at___private_Lean_Elab_LetRec_0__Lean_Elab_Term_mkLetRecDeclView___spec__20___lambda__2(x_14, x_3, x_21, x_26, x_46, x_45, x_66, x_69, x_4, x_5, x_6, x_7, x_8, x_9, x_67);
+lean_dec(x_14);
+x_70 = l_Array_mapMUnsafe_map___at___private_Lean_Elab_LetRec_0__Lean_Elab_Term_mkLetRecDeclView___spec__20___lambda__2(x_20, x_3, x_21, x_26, x_46, x_45, x_66, x_69, x_4, x_5, x_6, x_7, x_8, x_9, x_67);
 lean_dec(x_9);
 lean_dec(x_8);
 lean_dec(x_7);
@@ -2706,6 +2707,7 @@ else
 uint8_t x_71; 
 lean_dec(x_26);
 lean_dec(x_21);
+lean_dec(x_20);
 lean_dec(x_14);
 lean_dec(x_9);
 lean_dec(x_8);
@@ -4370,7 +4372,7 @@ uint8_t x_20;
 x_20 = !lean_is_exclusive(x_4);
 if (x_20 == 0)
 {
-lean_object* x_21; lean_object* x_22; lean_object* x_23; lean_object* x_24; lean_object* x_25; lean_object* x_26; lean_object* x_27; lean_object* x_28; lean_object* x_29; lean_object* x_30; lean_object* x_31; uint8_t x_32; lean_object* x_33; 
+lean_object* x_21; lean_object* x_22; lean_object* x_23; lean_object* x_24; lean_object* x_25; lean_object* x_26; lean_object* x_27; lean_object* x_28; lean_object* x_29; uint8_t x_30; lean_object* x_31; 
 x_21 = lean_ctor_get(x_4, 2);
 lean_dec(x_21);
 x_22 = lean_ctor_get(x_4, 1);
@@ -4385,34 +4387,31 @@ lean_ctor_set(x_4, 1, x_26);
 x_27 = lean_ctor_get(x_14, 0);
 lean_inc(x_27);
 lean_dec(x_14);
-x_28 = lean_unsigned_to_nat(0u);
-x_29 = l_Lean_Syntax_getArg(x_27, x_28);
-lean_dec(x_27);
-x_30 = lean_box(0);
-x_31 = lean_box(0);
-x_32 = 1;
+x_28 = lean_box(0);
+x_29 = lean_box(0);
+x_30 = 1;
 lean_inc(x_10);
 lean_inc(x_9);
 lean_inc(x_8);
 lean_inc(x_7);
 lean_inc(x_6);
 lean_inc(x_5);
-x_33 = l_Lean_Elab_Term_addTermInfo(x_29, x_24, x_30, x_30, x_31, x_32, x_5, x_6, x_7, x_8, x_9, x_10, x_11);
-if (lean_obj_tag(x_33) == 0)
+x_31 = l_Lean_Elab_Term_addTermInfo(x_27, x_24, x_28, x_28, x_29, x_30, x_5, x_6, x_7, x_8, x_9, x_10, x_11);
+if (lean_obj_tag(x_31) == 0)
 {
-lean_object* x_34; size_t x_35; size_t x_36; 
-x_34 = lean_ctor_get(x_33, 1);
-lean_inc(x_34);
-lean_dec(x_33);
-x_35 = 1;
-x_36 = lean_usize_add(x_3, x_35);
-x_3 = x_36;
-x_11 = x_34;
+lean_object* x_32; size_t x_33; size_t x_34; 
+x_32 = lean_ctor_get(x_31, 1);
+lean_inc(x_32);
+lean_dec(x_31);
+x_33 = 1;
+x_34 = lean_usize_add(x_3, x_33);
+x_3 = x_34;
+x_11 = x_32;
 goto _start;
 }
 else
 {
-uint8_t x_38; 
+uint8_t x_36; 
 lean_dec(x_4);
 lean_dec(x_10);
 lean_dec(x_9);
@@ -4420,97 +4419,94 @@ lean_dec(x_8);
 lean_dec(x_7);
 lean_dec(x_6);
 lean_dec(x_5);
-x_38 = !lean_is_exclusive(x_33);
-if (x_38 == 0)
+x_36 = !lean_is_exclusive(x_31);
+if (x_36 == 0)
 {
-return x_33;
+return x_31;
 }
 else
 {
-lean_object* x_39; lean_object* x_40; lean_object* x_41; 
-x_39 = lean_ctor_get(x_33, 0);
-x_40 = lean_ctor_get(x_33, 1);
-lean_inc(x_40);
-lean_inc(x_39);
-lean_dec(x_33);
-x_41 = lean_alloc_ctor(1, 2, 0);
-lean_ctor_set(x_41, 0, x_39);
-lean_ctor_set(x_41, 1, x_40);
-return x_41;
+lean_object* x_37; lean_object* x_38; lean_object* x_39; 
+x_37 = lean_ctor_get(x_31, 0);
+x_38 = lean_ctor_get(x_31, 1);
+lean_inc(x_38);
+lean_inc(x_37);
+lean_dec(x_31);
+x_39 = lean_alloc_ctor(1, 2, 0);
+lean_ctor_set(x_39, 0, x_37);
+lean_ctor_set(x_39, 1, x_38);
+return x_39;
 }
 }
 }
 else
 {
-lean_object* x_42; lean_object* x_43; lean_object* x_44; lean_object* x_45; lean_object* x_46; lean_object* x_47; lean_object* x_48; lean_object* x_49; lean_object* x_50; uint8_t x_51; lean_object* x_52; 
+lean_object* x_40; lean_object* x_41; lean_object* x_42; lean_object* x_43; lean_object* x_44; lean_object* x_45; lean_object* x_46; uint8_t x_47; lean_object* x_48; 
 lean_dec(x_4);
-x_42 = lean_array_fget(x_15, x_16);
-x_43 = lean_unsigned_to_nat(1u);
-x_44 = lean_nat_add(x_16, x_43);
+x_40 = lean_array_fget(x_15, x_16);
+x_41 = lean_unsigned_to_nat(1u);
+x_42 = lean_nat_add(x_16, x_41);
 lean_dec(x_16);
-x_45 = lean_alloc_ctor(0, 3, 0);
-lean_ctor_set(x_45, 0, x_15);
-lean_ctor_set(x_45, 1, x_44);
-lean_ctor_set(x_45, 2, x_17);
-x_46 = lean_ctor_get(x_14, 0);
-lean_inc(x_46);
+x_43 = lean_alloc_ctor(0, 3, 0);
+lean_ctor_set(x_43, 0, x_15);
+lean_ctor_set(x_43, 1, x_42);
+lean_ctor_set(x_43, 2, x_17);
+x_44 = lean_ctor_get(x_14, 0);
+lean_inc(x_44);
 lean_dec(x_14);
-x_47 = lean_unsigned_to_nat(0u);
-x_48 = l_Lean_Syntax_getArg(x_46, x_47);
-lean_dec(x_46);
-x_49 = lean_box(0);
-x_50 = lean_box(0);
-x_51 = 1;
+x_45 = lean_box(0);
+x_46 = lean_box(0);
+x_47 = 1;
 lean_inc(x_10);
 lean_inc(x_9);
 lean_inc(x_8);
 lean_inc(x_7);
 lean_inc(x_6);
 lean_inc(x_5);
-x_52 = l_Lean_Elab_Term_addTermInfo(x_48, x_42, x_49, x_49, x_50, x_51, x_5, x_6, x_7, x_8, x_9, x_10, x_11);
-if (lean_obj_tag(x_52) == 0)
+x_48 = l_Lean_Elab_Term_addTermInfo(x_44, x_40, x_45, x_45, x_46, x_47, x_5, x_6, x_7, x_8, x_9, x_10, x_11);
+if (lean_obj_tag(x_48) == 0)
 {
-lean_object* x_53; size_t x_54; size_t x_55; 
-x_53 = lean_ctor_get(x_52, 1);
-lean_inc(x_53);
-lean_dec(x_52);
-x_54 = 1;
-x_55 = lean_usize_add(x_3, x_54);
-x_3 = x_55;
-x_4 = x_45;
-x_11 = x_53;
+lean_object* x_49; size_t x_50; size_t x_51; 
+x_49 = lean_ctor_get(x_48, 1);
+lean_inc(x_49);
+lean_dec(x_48);
+x_50 = 1;
+x_51 = lean_usize_add(x_3, x_50);
+x_3 = x_51;
+x_4 = x_43;
+x_11 = x_49;
 goto _start;
 }
 else
 {
-lean_object* x_57; lean_object* x_58; lean_object* x_59; lean_object* x_60; 
-lean_dec(x_45);
+lean_object* x_53; lean_object* x_54; lean_object* x_55; lean_object* x_56; 
+lean_dec(x_43);
 lean_dec(x_10);
 lean_dec(x_9);
 lean_dec(x_8);
 lean_dec(x_7);
 lean_dec(x_6);
 lean_dec(x_5);
-x_57 = lean_ctor_get(x_52, 0);
-lean_inc(x_57);
-x_58 = lean_ctor_get(x_52, 1);
-lean_inc(x_58);
-if (lean_is_exclusive(x_52)) {
- lean_ctor_release(x_52, 0);
- lean_ctor_release(x_52, 1);
- x_59 = x_52;
+x_53 = lean_ctor_get(x_48, 0);
+lean_inc(x_53);
+x_54 = lean_ctor_get(x_48, 1);
+lean_inc(x_54);
+if (lean_is_exclusive(x_48)) {
+ lean_ctor_release(x_48, 0);
+ lean_ctor_release(x_48, 1);
+ x_55 = x_48;
 } else {
- lean_dec_ref(x_52);
- x_59 = lean_box(0);
+ lean_dec_ref(x_48);
+ x_55 = lean_box(0);
 }
-if (lean_is_scalar(x_59)) {
- x_60 = lean_alloc_ctor(1, 2, 0);
+if (lean_is_scalar(x_55)) {
+ x_56 = lean_alloc_ctor(1, 2, 0);
 } else {
- x_60 = x_59;
+ x_56 = x_55;
 }
-lean_ctor_set(x_60, 0, x_57);
-lean_ctor_set(x_60, 1, x_58);
-return x_60;
+lean_ctor_set(x_56, 0, x_53);
+lean_ctor_set(x_56, 1, x_54);
+return x_56;
 }
 }
 }