Expose span of LexError via public method

Author: dtolnay

src/fallback.rs

@@ -47,6 +47,10 @@ impl LexError {
             span: Span::call_site(),
         }
     }
+
+    pub(crate) fn span(&self) -> Span {
+        self.span
+    }
 }
 
 impl TokenStream {

src/lib.rs

@@ -250,6 +250,12 @@ impl Debug for TokenStream {
     }
 }
 
+impl LexError {
+    pub fn span(&self) -> Span {
+        Span::_new(self.inner.span())
+    }
+}
+
 impl Debug for LexError {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         Debug::fmt(&self.inner, f)

src/wrapper.rs

@@ -243,6 +243,15 @@ impl Debug for TokenStream {
     }
 }
 
+impl LexError {
+    pub(crate) fn span(&self) -> Span {
+        match self {
+            LexError::Compiler(_) => Span::call_site(),
+            LexError::Fallback(e) => Span::Fallback(e.span()),
+        }
+    }
+}
+
 impl From<proc_macro::LexError> for LexError {
     fn from(e: proc_macro::LexError) -> LexError {
         LexError::Compiler(e)