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refactor: improve "ident starts with number" error

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This commit is contained in:
Ezra Shaw 2023-03-17 21:41:26 +13:00
parent c9ddb73184
commit b4e17a5098
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6 changed files with 61 additions and 20 deletions
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12
compiler/rustc_span/src/lib.rs
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@ -795,6 +795,18 @@ impl Span {
})
}
/// Splits a span into two composite spans around a certain position.
pub fn split_at(self, pos: u32) -> (Span, Span) {
let len = self.hi().0 - self.lo().0;
debug_assert!(pos <= len);
let split_pos = BytePos(self.lo().0 + pos);
(
Span::new(self.lo(), split_pos, self.ctxt(), self.parent()),
Span::new(split_pos, self.hi(), self.ctxt(), self.parent()),
)
}
/// Returns a `Span` that would enclose both `self` and `end`.
///
/// Note that this can also be used to extend the span "backwards":