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!
rust-lang · Mar 22, 2021 · 014a4ee · 014a4ee
2 parents 1fdf7d1 + 688c857
commit 014a4ee
Showing 1 changed file with 5 additions and 2 deletions.
diff --git a/compiler/rustc_middle/src/ty/query/mod.rs b/compiler/rustc_middle/src/ty/query/mod.rs
@@ -217,8 +217,11 @@ macro_rules! define_callbacks {
             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),
                     ),)*
                 }
             }