e63539f305
Merge commit 740a164de from llvm git (by Richard Smith): PR46377: Fix dependence calculation for function types and typedef types. We previously did not treat a function type as dependent if it had a parameter pack with a non-dependent type -- such a function type depends on the arity of the pack so is dependent even though none of the parameter types is dependent. In order to properly handle this, we now treat pack expansion types as always being dependent types (depending on at least the pack arity), and always canonically being pack expansion types, even in the unusual case when the pattern is not a dependent type. This does mean that we can have canonical types that are pack expansions that contain no unexpanded packs, which is unfortunate but not inaccurate. We also previously did not treat a typedef type as instantiation-dependent if its canonical type was not instantiation-dependent. That's wrong because instantiation-dependence is a property of the type sugar, not of the type; an instantiation-dependent type can have a non-instantiation-dependent canonical type. Merge commit 9cf98d26e from llvm git (by Richard Smith): PR46637: Fix handling of placeholder types in trailing-return-types. Only permit a placeholder type in a trailing-return-type if it would also have been permitted in the decl-specifier sequence of a corresponding declaration with no trailing-return-type. The standard doesn't actually say this, but this is the only thing that makes sense. Also fix handling of an 'auto' in a trailing-return-type in a parameter of a generic lambda. We used to crash if we saw such a thing. Merge commit 234f51a65 from llvm git (by Richard Smith): Don't crash if we deserialize a pack expansion type whose pattern contains no packs. Fixes a regression from 740a164dec483225cbd02ab6c82199e2747ffacb. PR: 252892 Reported by: thierry MFC after: 3 days
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