Brent Royal-Gordon c504eb1b0a Warn if magic identifiers don’t match ...

When wrapping a function which is supposed to capture the caller’s location, there’s always a risk that the wrapper won’t capture the information the wrapped function wants; for instance, you might pass `(…, line, column)` where the callee expected `(…, column, line)`.

This commit emits a warning when a call passes an explicit argument to something that has a default argument, and that explicit argument is itself a parameter with a default argument, and both parameters use magic identifiers, but they use *different* magic identifiers.  This is partially in support of concise #file, but applies to all magic identifiers.

Fixes rdar://problem/58588633.

2020-01-21 14:28:16 -08:00

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