improve error message for when a query isn't supported

Author: hanar3

compiler/rustc_middle/src/ty/query.rs

@@ -275,11 +275,11 @@ macro_rules! define_callbacks {
             fn default() -> Self {
                 Providers {
                     $($name: |_, key| bug!(
-                        "`tcx.{}({:?})` unsupported for {} crate; \
-                         perhaps the `{}` query was never assigned a provider function. Queries can be either made to the local crate, or the external crate. This error means you tried to use it for one that's not supported.", 
+                        "`tcx.{}({:?})` is not supported for external or local crate;\n
+                        hint: Queries can be either made to the local crate, or the external crate. This error means you tried to use it for one that's not supported (likely the local crate).\n
+                        If that's not the case, {} was likely never assigned to a provider function.\n",
                         stringify!($name),
                         key,
-                        if key.query_crate_is_local() { "local" } : { "external" } ,
                         stringify!($name),
                     ),)*
                 }