Fix a common false-positive type mismatch #3376
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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.
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E.g. for
&{ some_string() }in a context where a&stris expected, wereported a mismatch inside the block. The problem is that we're passing an
expectation of
strdown, 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.