Alex Hoppen fa9f3f3337 [Sema] Correctly diagnose passing tuple as only argument to function with multiple parameters ...

If a tuple is passed as the only argument to a function that takes two unnamed arguments, we try to diagnose the missing argument label. However, in the old diagnose code we didn’t distinguish between non-existing arguments and arguments without labels; both behaved the same.

Thus, the missing second argument in the function call would line up with the empty second argument label, not producing a diagnostic, but hitting an assertion later on.

Distinguish between the two to fix the issue.

Fixes rdar://64319340

2021-03-19 12:58:17 +01:00

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