Rollup merge of #79639 - sasurau4:feature/add-long-explanation-E0212, r=GuillaumeGomez

Add long explanation for E0212

Helps with #61137

compiler/rustc_typeck/src/collect.rs

@@ -359,8 +359,8 @@ impl AstConv<'tcx> for ItemCtxt<'tcx> {
                 self.tcx().sess,
                 span,
                 E0212,
-                "cannot extract an associated type from a higher-ranked trait bound \
-                 in this context"
+                "cannot use the associated type of a trait \
+                 with uninferred generic parameters"
             );
 
             match self.node() {