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fix #15836 proc arg return type auto unexpectly match proc with concr… (#21065)

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* fix #15836 proc arg return type auto unexpectly match proc with concrete type

* fix #16244

* add test case for #12869
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Bung 2022-12-12 13:26:18 +08:00 • committed by GitHub
commit 5917c2d5b7
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12 changed files with 74 additions and 12 deletions
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compiler/semstmts.nim
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@ -2179,8 +2179,7 @@ proc semProcAux(c: PContext, n: PNode, kind: TSymKind,
if hasProto: localError(c.config, n.info, errImplOfXexpected % proto.name.s)
if {sfImportc, sfBorrow, sfError} * s.flags == {} and s.magic == mNone:
# this is a forward declaration and we're building the prototype
if s.kind in {skProc, skFunc} and s.typ[0] != nil and s.typ[0].kind == tyUntyped:
# `auto` is represented as `tyUntyped` at this point in compilation.
if s.kind in {skProc, skFunc} and s.typ[0] != nil and s.typ[0].kind == tyAnything:
localError(c.config, n[paramsPos][0].info, "return type 'auto' cannot be used in forward declarations")
incl(s.flags, sfForward)