bjoernager/rust
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Fortify dummy span checking

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This commit is contained in:
Vadim Petrochenkov 2018-06-25 01:00:21 +03:00
parent 297109ea32
commit 9f92fce77c
21 changed files with 59 additions and 59 deletions
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9
src/libsyntax_pos/lib.rs
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@ -248,6 +248,13 @@ impl Span {
self.data().with_ctxt(ctxt)
}
/// Returns `true` if this is a dummy span with any hygienic context.
#[inline]
pub fn is_dummy(self) -> bool {
let span = self.data();
span.lo.0 == 0 && span.hi.0 == 0
}
/// Returns a new span representing an empty span at the beginning of this span
#[inline]
pub fn shrink_to_lo(self) -> Span {
@ -263,7 +270,7 @@ impl Span {
/// Returns `self` if `self` is not the dummy span, and `other` otherwise.
pub fn substitute_dummy(self, other: Span) -> Span {
if self.source_equal(&DUMMY_SP) { other } else { self }
if self.is_dummy() { other } else { self }
}
/// Return true if `self` fully encloses `other`.