Rollup merge of #35644 - garekkream:update-E0302-new-error-format, r=jonathandturner

Update E0302 to the new format

Part of #35233.
Fixes #35523.

r? @jonathandturner

src/librustc_const_eval/check_match.rs

@@ -1187,7 +1187,9 @@ fn decl_without_init(&mut self, _: NodeId, _: Span) {}
     fn mutate(&mut self, _: NodeId, span: Span, _: cmt, mode: MutateMode) {
         match mode {
             MutateMode::JustWrite | MutateMode::WriteAndRead => {
-                span_err!(self.cx.tcx.sess, span, E0302, "cannot assign in a pattern guard")
+                struct_span_err!(self.cx.tcx.sess, span, E0302, "cannot assign in a pattern guard")
+                    .span_label(span, &format!("assignment in pattern guard"))
+                    .emit();
             }
             MutateMode::Init => {}
         }

src/test/compile-fail/E0302.rs

@@ -12,6 +12,7 @@ fn main() {
     match Some(()) {
         None => { },
         option if { option = None; false } => { }, //~ ERROR E0302
+        //~| NOTE assignment in pattern guard
         Some(_) => { }
     }
 }