Rollup merge of #83367 - richkadel:query-err-msg, r=jyn514

Improve error message for unassigned query provider

Fixes: #83122

r? `@jyn514`

This implements the change we agreed on. Thanks!

compiler/rustc_middle/src/ty/query/mod.rs

@@ -217,8 +217,11 @@ impl Default for Providers {
             fn default() -> Self {
                 Providers {
                     $($name: |_, key| bug!(
-                        "`tcx.{}({:?})` unsupported by its crate",
-                         stringify!($name), key
+                        "`tcx.{}({:?})` unsupported by its crate; \
+                         perhaps the `{}` query was never assigned a provider function",
+                        stringify!($name),
+                        key,
+                        stringify!($name),
                     ),)*
                 }
             }