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# ac73cafa 12-Oct-2020 Erich Keane <[email protected]>

Ensure TreeTransform considers ParmVarDecls as transformed Decls

See PR47804:

TreeTransform uses TransformedLocalDecls as a map of declarations that
have been transformed already. When doing a "Tra

Ensure TreeTransform considers ParmVarDecls as transformed Decls

See PR47804:

TreeTransform uses TransformedLocalDecls as a map of declarations that
have been transformed already. When doing a "TransformDecl", which
happens in the cases of updating a DeclRefExpr's target, the default
implementation simply returns the already transformed declaration.

However, this was not including ParmVarDecls. SO, any use of
TreeTransform that didn't re-implement TransformDecl would NOT properly
update the target of a DeclRefExpr, resulting in odd behavior.

In the case of Typo-recovery, the result was that a lambda that used its
own parameter would cause an error, since it thought that the
ParmVarDecl referenced was a different lambda. Additionally, this caused
a problem in the AST (a declrefexpr into another scope) such that a
future instantiation would cause an assertion.

This patch ensures that the ParmVarDecl transforming process records
into TransformedLocalDecls so that the DeclRefExpr is ALSO updated.

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