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Span::resolved_at and Span::located_at to combine behavior of two spans #47149

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Jan 5, 2018
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Span::resolved_at and Span::located_at to combine behavior of two spans #47149

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14 changes: 14 additions & 0 deletions src/libproc_macro/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -254,6 +254,20 @@ impl Span {
Some(Span(self.0.to(other.0)))
}

/// Creates a new span with the same line/column information as `self` but
/// that resolves symbols as though it were at `other`.
#[unstable(feature = "proc_macro", issue = "38356")]
pub fn resolved_at(&self, other: Span) -> Span {
Span(self.0.with_ctxt(other.0.ctxt()))
}

/// Creates a new span with the same name resolution behavior as `self` but
/// with the line/column information of `other`.
#[unstable(feature = "proc_macro", issue = "38356")]
pub fn located_at(&self, other: Span) -> Span {
other.resolved_at(*self)
}

diagnostic_method!(error, Level::Error);
diagnostic_method!(warning, Level::Warning);
diagnostic_method!(note, Level::Note);
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