[Clang] Fix crash in CheckNonTypeTemplateParameterType with invalid type #2
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SubstAutoTypeSourceInfoDependent can return null when transforming an invalid type containing decltype(auto). Handle this case by returning QualType() to signal failure. Fixes llvm#177545
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shafik
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Jan 28, 2026
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Looks good but this need a release note.
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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),
SubstAutoTypeSourceInfoDependentcan return null if the type is invalid.CheckNonTypeTemplateParameterTypewas not handling this case and would dereference the null pointer.Fixes llvm#177545