Don't ICE on operator trait methods with generic methods

Emit a fatal error instead.

3 files changed, 19 insertions, 1 deletions

diff --git a/compiler/rustc_error_messages/locales/en-US/hir_analysis.ftl b/compiler/rustc_error_messages/locales/en-US/hir_analysis.ftl
index 74088f4dfbe..d27edd47470 100644
--- a/compiler/rustc_error_messages/locales/en-US/hir_analysis.ftl
+++ b/compiler/rustc_error_messages/locales/en-US/hir_analysis.ftl
@@ -150,3 +150,6 @@ hir_analysis_const_bound_for_non_const_trait =
 hir_analysis_self_in_impl_self =
     `Self` is not valid in the self type of an impl block
     .note = replace `Self` with a different type
+
+hir_analysis_op_trait_generic_params =
+    `{$method_name}` must not have any generic parameters
diff --git a/compiler/rustc_hir_typeck/src/errors.rs b/compiler/rustc_hir_typeck/src/errors.rs
index cfb408396da..afac6e7d94a 100644
--- a/compiler/rustc_hir_typeck/src/errors.rs
+++ b/compiler/rustc_hir_typeck/src/errors.rs
@@ -125,3 +125,11 @@ pub struct AddMissingParenthesesInRange {
     #[suggestion_part(code = ")")]
     pub right: Span,
 }
+
+#[derive(Diagnostic)]
+#[diag(hir_analysis_op_trait_generic_params)]
+pub struct OpMethodGenericParams {
+    #[primary_span]
+    pub span: Span,
+    pub method_name: String,
+}
diff --git a/compiler/rustc_hir_typeck/src/method/mod.rs b/compiler/rustc_hir_typeck/src/method/mod.rs
index 2c7b3bbf31c..4a8b7749365 100644
--- a/compiler/rustc_hir_typeck/src/method/mod.rs
+++ b/compiler/rustc_hir_typeck/src/method/mod.rs
@@ -10,6 +10,7 @@ mod suggest;
 pub use self::suggest::SelfSource;
 pub use self::MethodError::*;
 
+use crate::errors::OpMethodGenericParams;
 use crate::{Expectation, FnCtxt};
 use rustc_data_structures::sync::Lrc;
 use rustc_errors::{Applicability, Diagnostic};
@@ -443,7 +444,13 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         };
         let def_id = method_item.def_id;
         let generics = tcx.generics_of(def_id);
-        assert_eq!(generics.params.len(), 0);
+
+        if generics.params.len() != 0 {
+            tcx.sess.emit_fatal(OpMethodGenericParams {
+                span: tcx.def_span(method_item.def_id),
+                method_name: m_name.to_string(),
+            });
+        }
 
         debug!("lookup_in_trait_adjusted: method_item={:?}", method_item);
         let mut obligations = vec![];