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[beta] Remove allocation from width of character function. #48730

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merged 1 commit into from
Mar 5, 2018
Merged

[beta] Remove allocation from width of character function. #48730

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8 changes: 5 additions & 3 deletions src/libsyntax/codemap.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -690,14 +690,16 @@ impl CodeMap {
return 1;
}

let src = local_begin.fm.external_src.borrow();

// We need to extend the snippet to the end of the src rather than to end_index so when
// searching forwards for boundaries we've got somewhere to search.
let snippet = if let Some(ref src) = local_begin.fm.src {
let len = src.len();
(&src[start_index..len]).to_string()
} else if let Some(src) = local_begin.fm.external_src.borrow().get_source() {
(&src[start_index..len])
} else if let Some(src) = src.get_source() {
let len = src.len();
(&src[start_index..len]).to_string()
(&src[start_index..len])
} else {
return 1;
};
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