Mike Ash d797473ea2 [swift-demangle] Warn when passed an empty argument. ...

We already have a warning when a single _ is passed, which catches the case where someone passes _$someMangledName and the shell expands it as a variable. But sometimes people do this without the leading underscore. Detect and warn about that case too.

2023-07-13 10:09:46 -04:00

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