lean4-htt/tests/lean/run/boxing_bug.lean
Henrik Böving dc70d0cc43
feat: split up the compiler SCC after lambda lifting (#12003)
This PR splits up the SCC that the compiler manages into (potentially)
multiple ones after
performing lambda lifting. This aids both the closed term extractor and
the elimDeadBranches pass as
they are both negatively influenced when more declarations than required
are within one SCC.
2026-01-14 18:36:25 +00:00

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def myCast : NatCast UInt8 where
natCast := UInt8.ofNat
class Semiring (α : Type u) where
[nsmul : SMul Nat α]
/--
trace: [Compiler.IR] [result]
def instSemiringUInt8._lam_0 (x_1 : @& tobj) (x_2 : u8) : u8 :=
let x_3 : u8 := UInt8.ofNat x_1;
let x_4 : u8 := UInt8.mul x_3 x_2;
ret x_4
def instSemiringUInt8._lam_0._boxed (x_1 : tobj) (x_2 : tagged) : tagged :=
let x_3 : u8 := unbox x_2;
let x_4 : u8 := instSemiringUInt8._lam_0 x_1 x_3;
dec x_1;
let x_5 : tagged := box x_4;
ret x_5
[Compiler.IR] [result]
def instSemiringUInt8._closed_0 : obj :=
let x_1 : obj := pap instSemiringUInt8._lam_0._boxed;
ret x_1
def instSemiringUInt8 : obj :=
let x_1 : obj := instSemiringUInt8._closed_0;
ret x_1
-/
#guard_msgs in
set_option trace.compiler.ir.result true in
attribute [local instance] myCast UInt8.intCast in
instance : Semiring UInt8 where
nsmul := ⟨(· * ·)⟩