Doug Gregor b129d7ec60 [Macros] Teach name lookup in macro expansions to look in expansion context ...

Teach ASTScope how to reason about macro expansions. When we create an
ASTScope for a source file that represents a macro expansion, its
parent scope node is the macro expansion itself. When performing
unqualified lookup (of any form), find the starting source file based
on the location, not on the source file provided---this ensures that
we start lookups within the macro expansion (for example).

The effect of this is to enable macro expansions to work in nested
contexts, where they refer to names in the scope in which the macro is
expanded.

This is decidedly unhiegenic, but it fits with our syntactic model.

2022-11-01 08:04:16 -07:00

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