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make unit structs and C-like enums immediate - #9699
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struct Foo;
fn foo() -> Foo { Foo }
Before:
; Function Attrs: nounwind readnone uwtable
define void @_ZN3foo18he8ca29755dedebbaf4v0.0E(%struct.Foo* noalias nocapture sret, { i64, %tydesc*, i8*, i8*, i8 }* nocapture) #0 {
"function top level":
ret void
}
After:
; Function Attrs: nounwind readnone uwtable
define %struct.Foo @_ZN3foo18he8ca29755dedebbaf4v0.0E({ i64, %tydesc*, i8*, i8*, i8 }* nocapture readnone) #0 {
"function top level":
ret %struct.Foo undef
}This fixes two existing bugs along the way:
* The `transmute` intrinsic did not correctly handle casts of immediate
aggregates like newtype structs and tuples.
* The code for calling foreign functions used the wrong type to create
an `alloca` temporary
enum Foo { A, B }
fn foo() -> Foo { A }
Before:
; Function Attrs: nounwind uwtable
define void @_ZN3foo18hbedc642d5d9cf5aag4v0.0E(%enum.Foo* noalias nocapture sret, { i64, %tydesc*, i8*, i8*, i8 }* nocapture readnone) #0 {
"function top level":
%2 = getelementptr inbounds %enum.Foo* %0, i64 0, i32 0
store i64 0, i64* %2, align 8
ret void
}
After:
; Function Attrs: nounwind readnone uwtable
define %enum.Foo @_ZN3foo18hbedc642d5d9cf5aag4v0.0E({ i64, %tydesc*, i8*, i8*, i8 }* nocapture readnone) #0 {
"function top level":
ret %enum.Foo zeroinitializer
}bors added a commit
that referenced
this pull request
Oct 3, 2013
struct Foo;
fn foo() -> Foo { Foo }
Before:
; Function Attrs: nounwind readnone uwtable
define void @_ZN3foo18he8ca29755dedebbaf4v0.0E(%struct.Foo* noalias nocapture sret, { i64, %tydesc*, i8*, i8*, i8 }* nocapture) #0 {
"function top level":
ret void
}
After:
; Function Attrs: nounwind readnone uwtable
define %struct.Foo @_ZN3foo18he8ca29755dedebbaf4v0.0E({ i64, %tydesc*, i8*, i8*, i8 }* nocapture readnone) #0 {
"function top level":
ret %struct.Foo undef
}U007D pushed a commit
to U007D/rust-mos
that referenced
this pull request
Aug 21, 2026
9699: fix: Fix generic_arg not parsing opt_generic_arg_list properly in arg lists r=Veykril a=Veykril Fixesrust-lang#9697 bors r+ Co-authored-by: Lukas Wirth <lukastw97@gmail.com>
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