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fixes #13736; Compiler crash with auto return type and recursion #26054

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fixes #13736; Compiler crash with auto return type and recursion #26054

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02da2cf
fixes #13736; Compiler crash with auto return type and recursion
ringabout Jul 29, 2026
e292ff9
improve handling of auto return types in recursive calls
ringabout Jul 30, 2026
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4 changes: 4 additions & 0 deletions compiler/semcall.nim
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Original file line number Diff line number Diff line change
Expand Up @@ -918,6 +918,10 @@ proc semResolvedCall(c: PContext, x: var TCandidate,
markUsed(c, info, finalCallee, isGenericInstance = true)
onUse(info, finalCallee, isGenericInstance = true)

if finalCallee == c.p.owner and finalCallee.typ.returnType != nil and
finalCallee.typ.returnType.kind == tyAnything:
localError(c.config, info, "cannot infer type of recursive call")

@arnetheduck arnetheduck Jul 29, 2026

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there's no fundamental reason the example should fail, ie it could take the type from the non-recursive branch

@Araq Araq Jul 29, 2026

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yeah we have the commonType mechanism to sort out these things.


result = compactVoidArgs(x.call)
instGenericConvertersSons(c, result, x)
markConvertersUsed(c, result)
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12 changes: 12 additions & 0 deletions tests/errmsgs/t13736.nim
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Original file line number Diff line number Diff line change
@@ -0,0 +1,12 @@
discard """
errormsg: "cannot infer type of recursive call"
line: 8
"""

proc foo(n: int): auto =
if n < 5:
return foo(n + 1)
else:
return 9

echo foo(3)
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