Various cleanups

Author: estebank

src/librustc_mir/borrow_check/conflict_errors.rs

@@ -1256,23 +1256,17 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
             Applicability::MachineApplicable,
         );
 
-        match category {
-            ConstraintCategory::Return => {
-                err.span_note(constraint_span, "closure is returned here");
-            }
-            ConstraintCategory::OpaqueType => {
-                err.span_note(constraint_span, "generator is returned here");
-            }
+        let msg = match category {
+            ConstraintCategory::Return => "closure is returned here".to_string(),
+            ConstraintCategory::OpaqueType => "generator is returned here".to_string(),
             ConstraintCategory::CallArgument => {
                 fr_name.highlight_region_name(&mut err);
-                err.span_note(
-                    constraint_span,
-                    &format!("function requires argument type to outlive `{}`", fr_name),
-                );
+                format!("function requires argument type to outlive `{}`", fr_name)
             }
             _ => bug!("report_escaping_closure_capture called with unexpected constraint \
                        category: `{:?}`", category),
-        }
+        };
+        err.span_note(constraint_span, &msg);
         err
     }
 

src/librustc_parse/parser/item.rs

@@ -490,9 +490,12 @@ impl<'a> Parser<'a> {
     }
 
     /// Parses a macro invocation inside a `trait`, `impl` or `extern` block.
-    fn parse_assoc_macro_invoc(&mut self, item_kind: &str, vis: Option<&Visibility>,
-                               at_end: &mut bool) -> PResult<'a, Option<Mac>>
-    {
+    fn parse_assoc_macro_invoc(
+        &mut self,
+        item_kind: &str,
+        vis: Option<&Visibility>,
+        at_end: &mut bool,
+    ) -> PResult<'a, Option<Mac>> {
         if self.token.is_path_start() &&
                 !(self.is_async_fn() && self.token.span.rust_2015()) {
             let prev_span = self.prev_span;
@@ -531,9 +534,11 @@ impl<'a> Parser<'a> {
         }
     }
 
-    fn missing_assoc_item_kind_err(&self, item_type: &str, prev_span: Span)
-                                   -> DiagnosticBuilder<'a>
-    {
+    fn missing_assoc_item_kind_err(
+        &self,
+        item_type: &str,
+        prev_span: Span,
+    ) -> DiagnosticBuilder<'a> {
         let expected_kinds = if item_type == "extern" {
             "missing `fn`, `type`, or `static`"
         } else {

src/librustc_resolve/resolve_imports.rs

@@ -1160,8 +1160,10 @@ impl<'a, 'b> ImportResolver<'a, 'b> {
                     .emit();
             } else {
                 let msg = format!("`{}` is private, and cannot be re-exported", ident);
-                let note_msg =
-                    format!("consider marking `{}` as `pub` in the imported module", ident);
+                let note_msg = format!(
+                    "consider marking `{}` as `pub` in the imported module",
+                    ident,
+                );
                 struct_span_err!(self.r.session, directive.span, E0364, "{}", &msg)
                     .span_note(directive.span, &note_msg)
                     .emit();

src/libsyntax_ext/proc_macro_harness.rs

@@ -270,7 +270,7 @@ impl<'a> Visitor<'a> for CollectProcMacros<'a> {
                     };
 
                     self.handler.struct_span_err(attr.span, &msg)
-                        .span_note(prev_attr.span, "previous attribute here")
+                        .span_label(prev_attr.span, "previous attribute here")
                         .emit();
 
                     return;