Upgrade proc-macro2 to 1.0.54android-u-beta-1-gpl

This project was upgraded with external_updater.
Usage: tools/external_updater/updater.sh update rust/crates/proc-macro2
For more info, check https://cs.android.com/android/platform/superproject/+/master:tools/external_updater/README.md

Test: TreeHugger
Change-Id: I4d181ea3ef5f030e4a9325c7866865a9f62cce0f

1 files changed, 11 insertions, 1 deletions

diff --git a/src/wrapper.rs b/src/wrapper.rs
index f5ec06b..00f67cd 100644
--- a/src/wrapper.rs
+++ b/src/wrapper.rs
@@ -40,7 +40,7 @@ impl LexError {
 }
 
 fn mismatch() -> ! {
-    panic!("stable/nightly mismatch")
+    panic!("compiler/fallback mismatch")
 }
 
 impl DeferredTokenStream {
@@ -530,6 +530,16 @@ impl Span {
         }
     }
 
+    pub fn source_text(&self) -> Option<String> {
+        match self {
+            #[cfg(not(no_source_text))]
+            Span::Compiler(s) => s.source_text(),
+            #[cfg(no_source_text)]
+            Span::Compiler(_) => None,
+            Span::Fallback(s) => s.source_text(),
+        }
+    }
+
     fn unwrap_nightly(self) -> proc_macro::Span {
         match self {
             Span::Compiler(s) => s,