Fix ICE in use_self lint

[flip1995]

The ICE is produced by building this span:

rust-clippy/clippy_lints/src/use_self.rs

Lines 55 to 60 in 55e7818

	let last_segment = last_segment.unwrap_or_else(|| path.segments.last().expect(SEGMENTS_MSG));
	// Path segments only include actual path, no methods or fields.
	let last_path_span = last_segment.ident.span;
	// Only take path up to the end of last_path_span.
	let span = path.span.with_hi(last_path_span.hi());

span can start in the file the macro is defined in and end where the macro is called.

changelog: Fix ICE in use_self lint

[flip1995]

@bors try

[bors]

⌛ Trying commit 2f10807 with merge 8025c14...

[flip1995]

Let's see, if we can enable the currently disabled integration tests (2f10807)

[bors]

☀️ Try build successful - checks-travis, status-appveyor
Build commit: 8025c14 (8025c149578eee3aece62ad045bfa03d1c102c39)

[phansch]

@bors r+

[bors]

📌 Commit 2f10807 has been approved by phansch

[bors]

⌛ Testing commit 2f10807 with merge 778ace3...

[bors]

☀️ Test successful - checks-travis, status-appveyor
Approved by: phansch
Pushing 778ace3 to master...