1 files changed, 27 insertions, 1 deletions
diff --git a/vendor/proc-macro2/src/fallback.rs b/vendor/proc-macro2/src/fallback.rs
index 378ef7e94..fe4f248d3 100644
--- a/vendor/proc-macro2/src/fallback.rs
+++ b/vendor/proc-macro2/src/fallback.rs
@@ -182,7 +182,13 @@ impl FromStr for TokenStream {
 
     fn from_str(src: &str) -> Result<TokenStream, LexError> {
         // Create a dummy file & add it to the source map
-        let cursor = get_cursor(src);
+        let mut cursor = get_cursor(src);
+
+        // Strip a byte order mark if present
+        const BYTE_ORDER_MARK: &str = "\u{feff}";
+        if cursor.starts_with(BYTE_ORDER_MARK) {
+            cursor = cursor.advance(BYTE_ORDER_MARK.len());
+        }
 
         parse::token_stream(cursor)
     }
@@ -512,6 +518,26 @@ impl Span {
         })
     }
 
+    #[cfg(procmacro2_semver_exempt)]
+    pub fn before(&self) -> Span {
+        Span {
+            #[cfg(span_locations)]
+            lo: self.lo,
+            #[cfg(span_locations)]
+            hi: self.lo,
+        }
+    }
+
+    #[cfg(procmacro2_semver_exempt)]
+    pub fn after(&self) -> Span {
+        Span {
+            #[cfg(span_locations)]
+            lo: self.hi,
+            #[cfg(span_locations)]
+            hi: self.hi,
+        }
+    }
+
     #[cfg(not(span_locations))]
     pub fn join(&self, _other: Span) -> Option<Span> {
         Some(Span {})