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[Clang] Fix crash in CheckNonTypeTemplateParameterType with invalid type #2

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[Clang] Fix crash in CheckNonTypeTemplateParameterType with invalid type #2

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@sdkrystian sdkrystian commented Jan 26, 2026 •
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When a non-type template parameter has a type containing an undeduced placeholder type that is invalid (e.g., a function returning a function), SubstAutoTypeSourceInfoDependent can return null if the type is invalid. CheckNonTypeTemplateParameterType was not handling this case and would dereference the null pointer.

Fixes llvm#177545
@sdkrystian
[Clang] Fix crash in CheckNonTypeTemplateParameterType with invalid type
0108771 
SubstAutoTypeSourceInfoDependent can return null when transforming an
invalid type containing decltype(auto). Handle this case by returning
QualType() to signal failure.

Fixes llvm#177545
shafik
shafik reviewed Jan 28, 2026
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Looks good but this need a release note.
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