Remove unnecessary lifetimes from rustc_expand.

Author: nnethercote

compiler/rustc_expand/src/proc_macro.rs

@@ -43,9 +43,9 @@ pub struct BangProcMacro {
 }
 
 impl base::BangProcMacro for BangProcMacro {
-    fn expand<'cx>(
+    fn expand(
         &self,
-        ecx: &'cx mut ExtCtxt<'_>,
+        ecx: &mut ExtCtxt<'_>,
         span: Span,
         input: TokenStream,
     ) -> Result<TokenStream, ErrorGuaranteed> {
@@ -73,9 +73,9 @@ pub struct AttrProcMacro {
 }
 
 impl base::AttrProcMacro for AttrProcMacro {
-    fn expand<'cx>(
+    fn expand(
         &self,
-        ecx: &'cx mut ExtCtxt<'_>,
+        ecx: &mut ExtCtxt<'_>,
         span: Span,
         annotation: TokenStream,
         annotated: TokenStream,