rustc_borrowck: suggest_make_local_mut(): label -> suggestions

The name 'label' doesn't make sense to me. Rename to 'suggestions' so
that it makes more sense.

Author: Enselic

compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs

@@ -1100,7 +1100,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
         }
         let decl_span = local_decl.source_info.span;
 
-        let label = match *local_decl.local_info() {
+        let suggestions = match *local_decl.local_info() {
             LocalInfo::User(mir::BindingForm::ImplicitSelf(_)) => {
                 let suggestion = suggest_ampmut_self(self.infcx.tcx, decl_span);
                 let additional =
@@ -1194,7 +1194,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
             _ => unreachable!(),
         };
 
-        match label {
+        match suggestions {
             Some((true, err_help_span, suggested_code, additional)) => {
                 let mut sugg = vec![(err_help_span, suggested_code)];
                 if let Some(s) = additional {