Merge pull request #472 from dtolnay/startend

Restore nightly behavior of Span::start and Span::end

Author: dtolnay

build/probe.rs

@@ -13,6 +13,22 @@ pub fn byte_range(this: &Span) -> Range<usize> {
     this.byte_range()
 }
 
+pub fn start(this: &Span) -> Span {
+    this.start()
+}
+
+pub fn end(this: &Span) -> Span {
+    this.end()
+}
+
+pub fn line(this: &Span) -> usize {
+    this.line()
+}
+
+pub fn column(this: &Span) -> usize {
+    this.column()
+}
+
 pub fn join(this: &Span, other: Span) -> Option<Span> {
     this.join(other)
 }

src/wrapper.rs

@@ -477,6 +477,12 @@ impl Span {
     #[cfg(span_locations)]
     pub fn start(&self) -> LineColumn {
         match self {
+            #[cfg(proc_macro_span)]
+            Span::Compiler(s) => LineColumn {
+                line: s.line(),
+                column: s.column().saturating_sub(1),
+            },
+            #[cfg(not(proc_macro_span))]
             Span::Compiler(_) => LineColumn { line: 0, column: 0 },
             Span::Fallback(s) => s.start(),
         }
@@ -485,6 +491,15 @@ impl Span {
     #[cfg(span_locations)]
     pub fn end(&self) -> LineColumn {
         match self {
+            #[cfg(proc_macro_span)]
+            Span::Compiler(s) => {
+                let end = s.end();
+                LineColumn {
+                    line: end.line(),
+                    column: end.column().saturating_sub(1),
+                }
+            }
+            #[cfg(not(proc_macro_span))]
             Span::Compiler(_) => LineColumn { line: 0, column: 0 },
             Span::Fallback(s) => s.end(),
         }