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Add comemnts clarifying logic

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This commit is contained in:
Esteban Küber 2019-03-28 20:18:50 -07:00
parent e13e9a5d63
commit 8fad69c200
1 changed files with 5 additions and 0 deletions
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5
src/librustc_errors/emitter.rs
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@ -314,8 +314,13 @@ impl EmitterWriter {
// | |______foo
// | baz
add_annotation_to_file(&mut output, file.clone(), ann.line_start, ann.as_start());
// 4 is the minimum vertical length of a multiline span when presented: two lines
// of code and two lines of underline. This is not true for the special case where
// the beginning doesn't have an underline, but the current logic seems to be
// working correctly.
let middle = min(ann.line_start + 4, ann.line_end);
for line in ann.line_start + 1..middle {
// Every `|` that joins the beginning of the span (`___^`) to the end (`|__^`).
add_annotation_to_file(&mut output, file.clone(), line, ann.as_line());
}
if middle < ann.line_end - 1 {