Merge #3376

3376: Fix a common false-positive type mismatch r=matklad a=flodiebold

E.g. for `&{ some_string() }` in a context where a `&str` is expected, we
reported a mismatch inside the block. The problem is that we're passing an
expectation of `str` down, but the expectation is more of a hint in this case.
There's a long comment in rustc about this, which I just copied.

Also, fix reported location for type mismatches in macros.

Co-authored-by: Florian Diebold <[email protected]>

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