diff --git a/library/init/lean/compiler/default.lean b/library/init/lean/compiler/default.lean
index 3a4f0cede3..0a3ffac0b1 100644
--- a/library/init/lean/compiler/default.lean
+++ b/library/init/lean/compiler/default.lean
@@ -9,3 +9,23 @@ import init.lean.compiler.ir
 import init.lean.compiler.pushproj
 import init.lean.compiler.elimdead
 import init.lean.compiler.simpcase
+
+namespace Lean
+namespace IR
+
+@[export lean.ir.test_core]
+def test (d : Decl) : IO Unit :=
+do IO.println d,
+   IO.println $ ("Max variable " ++ toString d.maxVar),
+   let d := d.pushProj,
+   IO.println "=== After push projections ===",
+   IO.println d,
+   let d := d.elimDead,
+   IO.println "=== After elim dead locals ===",
+   IO.println d,
+   let d := d.simpCase,
+   IO.println "=== After simplify case ===",
+   IO.println d
+
+end IR
+end Lean
diff --git a/src/library/compiler/ir.cpp b/src/library/compiler/ir.cpp
index 3376a2e4b4..a1b931bcc5 100644
--- a/src/library/compiler/ir.cpp
+++ b/src/library/compiler/ir.cpp
@@ -37,8 +37,7 @@ extern object * mk_unreachable_core;
 object * mk_alt_core(object * n, object * cidx, object * size, object * usize, object * ssize, object * b);
 object * mk_decl_core(object * f, object * xs, uint8 ty, object * b);
 object * decl_to_string_core(object * d);
-object * decl_max_var_core(object * d);
-object * decl_push_proj_core(object * d);
+object * test_core(object * d, object * w);
 /*
 inductive IRType
 | float | uint8 | uint16 | uint32 | uint64 | usize
@@ -115,13 +114,10 @@ std::string decl_to_string(decl const & d) {
     string_ref r(decl_to_string_core(d.raw()));
     return r.to_std_string();
 }
-nat decl_max_var(decl const & d) {
+void test(decl const & d) {
     inc(d.raw());
-    return nat(decl_max_var_core(d.raw()));
-}
-decl decl_push_proj(decl const & d) {
-    inc(d.raw());
-    return decl(decl_push_proj_core(d.raw()));
+    object * r = test_core(d.raw(), io_mk_world());
+    dec(r);
 }
 }
 
diff --git a/src/library/compiler/ir.h b/src/library/compiler/ir.h
index 2b62886cea..16e393491a 100644
--- a/src/library/compiler/ir.h
+++ b/src/library/compiler/ir.h
@@ -11,8 +11,7 @@ namespace lean {
 namespace ir {
 typedef object_ref decl;
 std::string decl_to_string(decl const & d);
-nat decl_max_var(decl const & d);
-decl decl_push_proj(decl const & d);
+void test(decl const & d);
 }
 ir::decl to_ir_decl(environment const & env, comp_decl const & d);
 }
diff --git a/src/library/compiler/llnf.cpp b/src/library/compiler/llnf.cpp
index 2eabd8cbc8..78b7431360 100644
--- a/src/library/compiler/llnf.cpp
+++ b/src/library/compiler/llnf.cpp
@@ -2417,11 +2417,7 @@ public:
 
 static void display_ir(environment const & env, comp_decl const & decl) {
     ir::decl d = to_ir_decl(env, decl);
-    tout() << ir::decl_to_string(d) << "\n";
-    tout() << "Max var: " << ir::decl_max_var(d).to_std_string() << "\n";
-    tout() << "after push proj\n";
-    d = ir::decl_push_proj(d);
-    tout() << ir::decl_to_string(d) << "\n";
+    ir::test(d);
 }
 
 pair<environment, comp_decls> to_llnf(environment const & env, comp_decls const & ds, bool unboxed) {
diff --git a/src/stage0/init/lean/compiler/default.cpp b/src/stage0/init/lean/compiler/default.cpp
index 5efee25020..7c3ab8f8fc 100644
--- a/src/stage0/init/lean/compiler/default.cpp
+++ b/src/stage0/init/lean/compiler/default.cpp
@@ -14,6 +14,397 @@ typedef lean::uint32 uint32; typedef lean::uint64 uint64;
 #pragma GCC diagnostic ignored "-Wunused-label"
 #pragma GCC diagnostic ignored "-Wunused-but-set-variable"
 #endif
+obj* l_Lean_IR_test___closed__2;
+namespace lean {
+namespace ir {
+obj* test_core(obj*, obj*);
+}}
+namespace lean {
+namespace ir {
+obj* decl_to_string_core(obj*);
+}}
+extern "C" obj* lean_io_prim_put_str(obj*, obj*);
+obj* l_IO_println___at_Lean_IR_test___spec__1(obj*, obj*);
+obj* l_Lean_IR_Decl_pushProj___main(obj*);
+obj* l_Lean_IR_test___closed__1;
+obj* l_Lean_IR_Decl_elimDead___main(obj*);
+obj* l_IO_println___at_HasRepr_HasEval___spec__1(obj*, obj*);
+obj* l_IO_print___at_Lean_IR_test___spec__2(obj*, obj*);
+obj* l_Lean_IR_Decl_simpCase___main(obj*);
+extern obj* l_IO_println___rarg___closed__1;
+obj* l_Lean_IR_test___closed__3;
+obj* l_IO_print___at_Lean_IR_test___spec__2(obj* x_0, obj* x_1) {
+_start:
+{
+obj* x_2; obj* x_3; 
+x_2 = lean::ir::decl_to_string_core(x_0);
+x_3 = lean_io_prim_put_str(x_2, x_1);
+lean::dec(x_2);
+return x_3;
+}
+}
+obj* l_IO_println___at_Lean_IR_test___spec__1(obj* x_0, obj* x_1) {
+_start:
+{
+obj* x_2; 
+x_2 = l_IO_print___at_Lean_IR_test___spec__2(x_0, x_1);
+if (lean::obj_tag(x_2) == 0)
+{
+obj* x_3; obj* x_5; obj* x_6; obj* x_7; obj* x_8; obj* x_9; 
+x_3 = lean::cnstr_get(x_2, 1);
+if (lean::is_exclusive(x_2)) {
+ lean::cnstr_release(x_2, 0);
+ x_5 = x_2;
+} else {
+ lean::inc(x_3);
+ lean::dec(x_2);
+ x_5 = lean::box(0);
+}
+x_6 = lean::box(0);
+if (lean::is_scalar(x_5)) {
+ x_7 = lean::alloc_cnstr(0, 2, 0);
+} else {
+ x_7 = x_5;
+}
+lean::cnstr_set(x_7, 0, x_6);
+lean::cnstr_set(x_7, 1, x_3);
+x_8 = l_IO_println___rarg___closed__1;
+x_9 = lean_io_prim_put_str(x_8, x_7);
+return x_9;
+}
+else
+{
+obj* x_10; obj* x_12; obj* x_14; obj* x_15; 
+x_10 = lean::cnstr_get(x_2, 0);
+x_12 = lean::cnstr_get(x_2, 1);
+if (lean::is_exclusive(x_2)) {
+ x_14 = x_2;
+} else {
+ lean::inc(x_10);
+ lean::inc(x_12);
+ lean::dec(x_2);
+ x_14 = lean::box(0);
+}
+if (lean::is_scalar(x_14)) {
+ x_15 = lean::alloc_cnstr(1, 2, 0);
+} else {
+ x_15 = x_14;
+}
+lean::cnstr_set(x_15, 0, x_10);
+lean::cnstr_set(x_15, 1, x_12);
+return x_15;
+}
+}
+}
+obj* _init_l_Lean_IR_test___closed__1() {
+_start:
+{
+obj* x_0; 
+x_0 = lean::mk_string("=== After push projections ===");
+return x_0;
+}
+}
+obj* _init_l_Lean_IR_test___closed__2() {
+_start:
+{
+obj* x_0; 
+x_0 = lean::mk_string("=== After elim dead locals ===");
+return x_0;
+}
+}
+obj* _init_l_Lean_IR_test___closed__3() {
+_start:
+{
+obj* x_0; 
+x_0 = lean::mk_string("=== After simplify case ===");
+return x_0;
+}
+}
+namespace lean {
+namespace ir {
+obj* test_core(obj* x_0, obj* x_1) {
+_start:
+{
+obj* x_3; 
+lean::inc(x_0);
+x_3 = l_IO_println___at_Lean_IR_test___spec__1(x_0, x_1);
+if (lean::obj_tag(x_3) == 0)
+{
+obj* x_4; obj* x_6; obj* x_7; obj* x_8; obj* x_9; obj* x_10; obj* x_11; 
+x_4 = lean::cnstr_get(x_3, 1);
+if (lean::is_exclusive(x_3)) {
+ lean::cnstr_release(x_3, 0);
+ x_6 = x_3;
+} else {
+ lean::inc(x_4);
+ lean::dec(x_3);
+ x_6 = lean::box(0);
+}
+x_7 = lean::box(0);
+if (lean::is_scalar(x_6)) {
+ x_8 = lean::alloc_cnstr(0, 2, 0);
+} else {
+ x_8 = x_6;
+}
+lean::cnstr_set(x_8, 0, x_7);
+lean::cnstr_set(x_8, 1, x_4);
+x_9 = l_Lean_IR_Decl_pushProj___main(x_0);
+x_10 = l_Lean_IR_test___closed__1;
+x_11 = l_IO_println___at_HasRepr_HasEval___spec__1(x_10, x_8);
+if (lean::obj_tag(x_11) == 0)
+{
+obj* x_12; obj* x_14; obj* x_15; obj* x_17; 
+x_12 = lean::cnstr_get(x_11, 1);
+if (lean::is_exclusive(x_11)) {
+ lean::cnstr_release(x_11, 0);
+ x_14 = x_11;
+} else {
+ lean::inc(x_12);
+ lean::dec(x_11);
+ x_14 = lean::box(0);
+}
+if (lean::is_scalar(x_14)) {
+ x_15 = lean::alloc_cnstr(0, 2, 0);
+} else {
+ x_15 = x_14;
+}
+lean::cnstr_set(x_15, 0, x_7);
+lean::cnstr_set(x_15, 1, x_12);
+lean::inc(x_9);
+x_17 = l_IO_println___at_Lean_IR_test___spec__1(x_9, x_15);
+if (lean::obj_tag(x_17) == 0)
+{
+obj* x_18; obj* x_20; obj* x_21; obj* x_22; obj* x_23; obj* x_24; 
+x_18 = lean::cnstr_get(x_17, 1);
+if (lean::is_exclusive(x_17)) {
+ lean::cnstr_release(x_17, 0);
+ x_20 = x_17;
+} else {
+ lean::inc(x_18);
+ lean::dec(x_17);
+ x_20 = lean::box(0);
+}
+if (lean::is_scalar(x_20)) {
+ x_21 = lean::alloc_cnstr(0, 2, 0);
+} else {
+ x_21 = x_20;
+}
+lean::cnstr_set(x_21, 0, x_7);
+lean::cnstr_set(x_21, 1, x_18);
+x_22 = l_Lean_IR_Decl_elimDead___main(x_9);
+x_23 = l_Lean_IR_test___closed__2;
+x_24 = l_IO_println___at_HasRepr_HasEval___spec__1(x_23, x_21);
+if (lean::obj_tag(x_24) == 0)
+{
+obj* x_25; obj* x_27; obj* x_28; obj* x_30; 
+x_25 = lean::cnstr_get(x_24, 1);
+if (lean::is_exclusive(x_24)) {
+ lean::cnstr_release(x_24, 0);
+ x_27 = x_24;
+} else {
+ lean::inc(x_25);
+ lean::dec(x_24);
+ x_27 = lean::box(0);
+}
+if (lean::is_scalar(x_27)) {
+ x_28 = lean::alloc_cnstr(0, 2, 0);
+} else {
+ x_28 = x_27;
+}
+lean::cnstr_set(x_28, 0, x_7);
+lean::cnstr_set(x_28, 1, x_25);
+lean::inc(x_22);
+x_30 = l_IO_println___at_Lean_IR_test___spec__1(x_22, x_28);
+if (lean::obj_tag(x_30) == 0)
+{
+obj* x_31; obj* x_33; obj* x_34; obj* x_35; obj* x_36; obj* x_37; 
+x_31 = lean::cnstr_get(x_30, 1);
+if (lean::is_exclusive(x_30)) {
+ lean::cnstr_release(x_30, 0);
+ x_33 = x_30;
+} else {
+ lean::inc(x_31);
+ lean::dec(x_30);
+ x_33 = lean::box(0);
+}
+if (lean::is_scalar(x_33)) {
+ x_34 = lean::alloc_cnstr(0, 2, 0);
+} else {
+ x_34 = x_33;
+}
+lean::cnstr_set(x_34, 0, x_7);
+lean::cnstr_set(x_34, 1, x_31);
+x_35 = l_Lean_IR_Decl_simpCase___main(x_22);
+x_36 = l_Lean_IR_test___closed__3;
+x_37 = l_IO_println___at_HasRepr_HasEval___spec__1(x_36, x_34);
+if (lean::obj_tag(x_37) == 0)
+{
+obj* x_38; obj* x_40; obj* x_41; obj* x_42; 
+x_38 = lean::cnstr_get(x_37, 1);
+if (lean::is_exclusive(x_37)) {
+ lean::cnstr_release(x_37, 0);
+ x_40 = x_37;
+} else {
+ lean::inc(x_38);
+ lean::dec(x_37);
+ x_40 = lean::box(0);
+}
+if (lean::is_scalar(x_40)) {
+ x_41 = lean::alloc_cnstr(0, 2, 0);
+} else {
+ x_41 = x_40;
+}
+lean::cnstr_set(x_41, 0, x_7);
+lean::cnstr_set(x_41, 1, x_38);
+x_42 = l_IO_println___at_Lean_IR_test___spec__1(x_35, x_41);
+return x_42;
+}
+else
+{
+obj* x_44; obj* x_46; obj* x_48; obj* x_49; 
+lean::dec(x_35);
+x_44 = lean::cnstr_get(x_37, 0);
+x_46 = lean::cnstr_get(x_37, 1);
+if (lean::is_exclusive(x_37)) {
+ x_48 = x_37;
+} else {
+ lean::inc(x_44);
+ lean::inc(x_46);
+ lean::dec(x_37);
+ x_48 = lean::box(0);
+}
+if (lean::is_scalar(x_48)) {
+ x_49 = lean::alloc_cnstr(1, 2, 0);
+} else {
+ x_49 = x_48;
+}
+lean::cnstr_set(x_49, 0, x_44);
+lean::cnstr_set(x_49, 1, x_46);
+return x_49;
+}
+}
+else
+{
+obj* x_51; obj* x_53; obj* x_55; obj* x_56; 
+lean::dec(x_22);
+x_51 = lean::cnstr_get(x_30, 0);
+x_53 = lean::cnstr_get(x_30, 1);
+if (lean::is_exclusive(x_30)) {
+ x_55 = x_30;
+} else {
+ lean::inc(x_51);
+ lean::inc(x_53);
+ lean::dec(x_30);
+ x_55 = lean::box(0);
+}
+if (lean::is_scalar(x_55)) {
+ x_56 = lean::alloc_cnstr(1, 2, 0);
+} else {
+ x_56 = x_55;
+}
+lean::cnstr_set(x_56, 0, x_51);
+lean::cnstr_set(x_56, 1, x_53);
+return x_56;
+}
+}
+else
+{
+obj* x_58; obj* x_60; obj* x_62; obj* x_63; 
+lean::dec(x_22);
+x_58 = lean::cnstr_get(x_24, 0);
+x_60 = lean::cnstr_get(x_24, 1);
+if (lean::is_exclusive(x_24)) {
+ x_62 = x_24;
+} else {
+ lean::inc(x_58);
+ lean::inc(x_60);
+ lean::dec(x_24);
+ x_62 = lean::box(0);
+}
+if (lean::is_scalar(x_62)) {
+ x_63 = lean::alloc_cnstr(1, 2, 0);
+} else {
+ x_63 = x_62;
+}
+lean::cnstr_set(x_63, 0, x_58);
+lean::cnstr_set(x_63, 1, x_60);
+return x_63;
+}
+}
+else
+{
+obj* x_65; obj* x_67; obj* x_69; obj* x_70; 
+lean::dec(x_9);
+x_65 = lean::cnstr_get(x_17, 0);
+x_67 = lean::cnstr_get(x_17, 1);
+if (lean::is_exclusive(x_17)) {
+ x_69 = x_17;
+} else {
+ lean::inc(x_65);
+ lean::inc(x_67);
+ lean::dec(x_17);
+ x_69 = lean::box(0);
+}
+if (lean::is_scalar(x_69)) {
+ x_70 = lean::alloc_cnstr(1, 2, 0);
+} else {
+ x_70 = x_69;
+}
+lean::cnstr_set(x_70, 0, x_65);
+lean::cnstr_set(x_70, 1, x_67);
+return x_70;
+}
+}
+else
+{
+obj* x_72; obj* x_74; obj* x_76; obj* x_77; 
+lean::dec(x_9);
+x_72 = lean::cnstr_get(x_11, 0);
+x_74 = lean::cnstr_get(x_11, 1);
+if (lean::is_exclusive(x_11)) {
+ x_76 = x_11;
+} else {
+ lean::inc(x_72);
+ lean::inc(x_74);
+ lean::dec(x_11);
+ x_76 = lean::box(0);
+}
+if (lean::is_scalar(x_76)) {
+ x_77 = lean::alloc_cnstr(1, 2, 0);
+} else {
+ x_77 = x_76;
+}
+lean::cnstr_set(x_77, 0, x_72);
+lean::cnstr_set(x_77, 1, x_74);
+return x_77;
+}
+}
+else
+{
+obj* x_79; obj* x_81; obj* x_83; obj* x_84; 
+lean::dec(x_0);
+x_79 = lean::cnstr_get(x_3, 0);
+x_81 = lean::cnstr_get(x_3, 1);
+if (lean::is_exclusive(x_3)) {
+ x_83 = x_3;
+} else {
+ lean::inc(x_79);
+ lean::inc(x_81);
+ lean::dec(x_3);
+ x_83 = lean::box(0);
+}
+if (lean::is_scalar(x_83)) {
+ x_84 = lean::alloc_cnstr(1, 2, 0);
+} else {
+ x_84 = x_83;
+}
+lean::cnstr_set(x_84, 0, x_79);
+lean::cnstr_set(x_84, 1, x_81);
+return x_84;
+}
+}
+}
+}}
 obj* initialize_init_lean_compiler_constfolding(obj*);
 obj* initialize_init_lean_compiler_ir(obj*);
 obj* initialize_init_lean_compiler_pushproj(obj*);
@@ -34,5 +425,11 @@ w = initialize_init_lean_compiler_elimdead(w);
 if (io_result_is_error(w)) return w;
 w = initialize_init_lean_compiler_simpcase(w);
 if (io_result_is_error(w)) return w;
+ l_Lean_IR_test___closed__1 = _init_l_Lean_IR_test___closed__1();
+lean::mark_persistent(l_Lean_IR_test___closed__1);
+ l_Lean_IR_test___closed__2 = _init_l_Lean_IR_test___closed__2();
+lean::mark_persistent(l_Lean_IR_test___closed__2);
+ l_Lean_IR_test___closed__3 = _init_l_Lean_IR_test___closed__3();
+lean::mark_persistent(l_Lean_IR_test___closed__3);
 return w;
 }