Mark all extraneous generic args as errors

compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs

@@ -442,6 +442,25 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
             ) -> ty::GenericArg<'tcx> {
                 let tcx = self.lowerer.tcx();
 
+                if let Err(incorrect) = self.incorrect_args {
+                    if incorrect.invalid_args.contains(&(param.index as usize)) {
+                        return match param.kind {
+                            GenericParamDefKind::Lifetime => {
+                                ty::Region::new_error(tcx, incorrect.reported).into()
+                            }
+                            GenericParamDefKind::Type { .. } => {
+                                Ty::new_error(tcx, incorrect.reported).into()
+                            }
+                            GenericParamDefKind::Const { .. } => ty::Const::new_error(
+                                tcx,
+                                incorrect.reported,
+                                Ty::new_error(tcx, incorrect.reported),
+                            )
+                            .into(),
+                        };
+                    }
+                }
+
                 let mut handle_ty_args = |has_default, ty: &hir::Ty<'tcx>| {
                     if has_default {
                         tcx.check_optional_stability(

tests/crashes/121134.rs

@@ -1,20 +0,0 @@
-//@ known-bug: #121134
-trait Output<'a> {
-    type Type;
-}
-
-struct Wrapper;
-
-impl Wrapper {
-    fn do_something_wrapper<O, F>(&mut self, do_something_wrapper: F)
-    where
-        FnOnce:,
-        F: for<'a> FnOnce(<F as Output<i32, _>>::Type),
-    {
-    }
-}
-
-fn main() {
-    let mut wrapper = Wrapper;
-    wrapper.do_something_wrapper::<i32, _>(|value| ());
-}

tests/ui/traits/associated_type_bound/116464-invalid-assoc-type-suggestion-in-trait-impl.rs

@@ -14,14 +14,12 @@ impl<T, S> Trait<T> for i32 {
 // Should not not trigger suggestion here...
 impl<T, S> Trait<T, S> for () {}
 //~^ ERROR trait takes 1 generic argument but 2 generic arguments were supplied
-//~| ERROR `S` is not constrained
 
 //... but should do so in all of the below cases except the last one
 fn func<T: Trait<u32, String>>(t: T) -> impl Trait<(), i32> {
 //~^ ERROR trait takes 1 generic argument but 2 generic arguments were supplied
 //~| ERROR trait takes 1 generic argument but 2 generic arguments were supplied
 //~| ERROR trait takes 1 generic argument but 2 generic arguments were supplied
-//~| ERROR type annotations needed
     3
 }
 

tests/ui/traits/associated_type_bound/116464-invalid-assoc-type-suggestion-in-trait-impl.stderr

@@ -16,14 +16,8 @@ note: trait defined here, with 1 generic parameter: `T`
 LL | pub trait Trait<T> {
    |           ^^^^^ -
 
-error[E0207]: the type parameter `S` is not constrained by the impl trait, self type, or predicates
-  --> $DIR/116464-invalid-assoc-type-suggestion-in-trait-impl.rs:15:9
-   |
-LL | impl<T, S> Trait<T, S> for () {}
-   |         ^ unconstrained type parameter
-
 error[E0107]: trait takes 1 generic argument but 2 generic arguments were supplied
-  --> $DIR/116464-invalid-assoc-type-suggestion-in-trait-impl.rs:20:12
+  --> $DIR/116464-invalid-assoc-type-suggestion-in-trait-impl.rs:19:12
    |
 LL | fn func<T: Trait<u32, String>>(t: T) -> impl Trait<(), i32> {
    |            ^^^^^ expected 1 generic argument
@@ -39,7 +33,7 @@ LL | fn func<T: Trait<u32, Assoc = String>>(t: T) -> impl Trait<(), i32> {
    |                       +++++++
 
 error[E0107]: trait takes 1 generic argument but 2 generic arguments were supplied
-  --> $DIR/116464-invalid-assoc-type-suggestion-in-trait-impl.rs:20:46
+  --> $DIR/116464-invalid-assoc-type-suggestion-in-trait-impl.rs:19:46
    |
 LL | fn func<T: Trait<u32, String>>(t: T) -> impl Trait<(), i32> {
    |                                              ^^^^^ expected 1 generic argument
@@ -55,7 +49,7 @@ LL | fn func<T: Trait<u32, String>>(t: T) -> impl Trait<(), Assoc = i32> {
    |                                                        +++++++
 
 error[E0107]: trait takes 1 generic argument but 2 generic arguments were supplied
-  --> $DIR/116464-invalid-assoc-type-suggestion-in-trait-impl.rs:20:46
+  --> $DIR/116464-invalid-assoc-type-suggestion-in-trait-impl.rs:19:46
    |
 LL | fn func<T: Trait<u32, String>>(t: T) -> impl Trait<(), i32> {
    |                                              ^^^^^ expected 1 generic argument
@@ -71,14 +65,8 @@ help: replace the generic bound with the associated type
 LL | fn func<T: Trait<u32, String>>(t: T) -> impl Trait<(), Assoc = i32> {
    |                                                        +++++++
 
-error[E0282]: type annotations needed
-  --> $DIR/116464-invalid-assoc-type-suggestion-in-trait-impl.rs:20:41
-   |
-LL | fn func<T: Trait<u32, String>>(t: T) -> impl Trait<(), i32> {
-   |                                         ^^^^^^^^^^^^^^^^^^^ cannot infer type
-
 error[E0107]: trait takes 1 generic argument but 2 generic arguments were supplied
-  --> $DIR/116464-invalid-assoc-type-suggestion-in-trait-impl.rs:28:18
+  --> $DIR/116464-invalid-assoc-type-suggestion-in-trait-impl.rs:26:18
    |
 LL | struct Struct<T: Trait<u32, String>> {
    |                  ^^^^^ expected 1 generic argument
@@ -94,7 +82,7 @@ LL | struct Struct<T: Trait<u32, Assoc = String>> {
    |                             +++++++
 
 error[E0107]: trait takes 1 generic argument but 2 generic arguments were supplied
-  --> $DIR/116464-invalid-assoc-type-suggestion-in-trait-impl.rs:33:23
+  --> $DIR/116464-invalid-assoc-type-suggestion-in-trait-impl.rs:31:23
    |
 LL | trait AnotherTrait<T: Trait<T, i32>> {}
    |                       ^^^^^ expected 1 generic argument
@@ -110,7 +98,7 @@ LL | trait AnotherTrait<T: Trait<T, Assoc = i32>> {}
    |                                +++++++
 
 error[E0107]: trait takes 1 generic argument but 2 generic arguments were supplied
-  --> $DIR/116464-invalid-assoc-type-suggestion-in-trait-impl.rs:36:9
+  --> $DIR/116464-invalid-assoc-type-suggestion-in-trait-impl.rs:34:9
    |
 LL | impl<T: Trait<u32, String>> Struct<T> {}
    |         ^^^^^ expected 1 generic argument
@@ -126,7 +114,7 @@ LL | impl<T: Trait<u32, Assoc = String>> Struct<T> {}
    |                    +++++++
 
 error[E0107]: struct takes 1 generic argument but 2 generic arguments were supplied
-  --> $DIR/116464-invalid-assoc-type-suggestion-in-trait-impl.rs:42:58
+  --> $DIR/116464-invalid-assoc-type-suggestion-in-trait-impl.rs:40:58
    |
 LL | impl<T: Trait<u32, Assoc=String>, U> YetAnotherTrait for Struct<T, U> {}
    |                                                          ^^^^^^    - help: remove this generic argument
@@ -134,12 +122,12 @@ LL | impl<T: Trait<u32, Assoc=String>, U> YetAnotherTrait for Struct<T, U> {}
    |                                                          expected 1 generic argument
    |
 note: struct defined here, with 1 generic parameter: `T`
-  --> $DIR/116464-invalid-assoc-type-suggestion-in-trait-impl.rs:28:8
+  --> $DIR/116464-invalid-assoc-type-suggestion-in-trait-impl.rs:26:8
    |
 LL | struct Struct<T: Trait<u32, String>> {
    |        ^^^^^^ -
 
-error: aborting due to 11 previous errors
+error: aborting due to 9 previous errors
 
-Some errors have detailed explanations: E0107, E0207, E0282.
+Some errors have detailed explanations: E0107, E0207.
 For more information about an error, try `rustc --explain E0107`.

tests/ui/traits/generic_param_mismatch_in_unsatisfied_projection.rs

@@ -0,0 +1,27 @@
+//! This test used to ICE: #121134
+//! The issue is that we're trying to prove a projection, but there's
+//! no bound for the projection's trait, and the projection has the wrong
+//! kind of generic parameter (lifetime vs type).
+//! When actually calling the function with those broken bounds, trying to
+//! instantiate the bounds with inference vars would ICE.
+#![feature(unboxed_closures)]
+
+trait Output<'a> {
+    type Type;
+}
+
+struct Wrapper;
+
+impl Wrapper {
+    fn do_something_wrapper<O, F>(&mut self, _: F)
+    where
+        F: for<'a> FnOnce(<F as Output<i32>>::Type),
+        //~^ ERROR: trait takes 0 generic arguments but 1 generic argument was supplied
+    {
+    }
+}
+
+fn main() {
+    let mut wrapper = Wrapper;
+    wrapper.do_something_wrapper(|value| ());
+}

tests/ui/traits/generic_param_mismatch_in_unsatisfied_projection.stderr

@@ -0,0 +1,19 @@
+error[E0107]: trait takes 0 generic arguments but 1 generic argument was supplied
+  --> $DIR/generic_param_mismatch_in_unsatisfied_projection.rs:18:33
+   |
+LL |         F: for<'a> FnOnce(<F as Output<i32>>::Type),
+   |                                 ^^^^^^ expected 0 generic arguments
+   |
+note: trait defined here, with 0 generic parameters
+  --> $DIR/generic_param_mismatch_in_unsatisfied_projection.rs:9:7
+   |
+LL | trait Output<'a> {
+   |       ^^^^^^
+help: replace the generic bound with the associated type
+   |
+LL |         F: for<'a> FnOnce(<F as Output<Type = i32>>::Type),
+   |                                        ++++++
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0107`.

tests/ui/transmutability/issue-101739-2.rs

@@ -15,7 +15,6 @@ mod assert {
     >()
     where
         Dst: BikeshedIntrinsicFrom< //~ ERROR trait takes at most 2 generic arguments but 5 generic arguments were supplied
-        //~^ ERROR: the constant `ASSUME_ALIGNMENT` is not of type `Assume`
             Src,
             ASSUME_ALIGNMENT, //~ ERROR: mismatched types
             ASSUME_LIFETIMES,

tests/ui/transmutability/issue-101739-2.stderr

@@ -9,29 +9,13 @@ LL | |             ASSUME_VALIDITY,
 LL | |             ASSUME_VISIBILITY,
    | |_____________________________- help: remove these generic arguments
 
-error: the constant `ASSUME_ALIGNMENT` is not of type `Assume`
-  --> $DIR/issue-101739-2.rs:17:14
-   |
-LL |           Dst: BikeshedIntrinsicFrom<
-   |  ______________^
-LL | |
-LL | |             Src,
-LL | |             ASSUME_ALIGNMENT,
-...  |
-LL | |             ASSUME_VISIBILITY,
-LL | |         >,
-   | |_________^ expected `Assume`, found `bool`
-   |
-note: required by a bound in `BikeshedIntrinsicFrom`
-  --> $SRC_DIR/core/src/mem/transmutability.rs:LL:COL
-
 error[E0308]: mismatched types
-  --> $DIR/issue-101739-2.rs:20:13
+  --> $DIR/issue-101739-2.rs:19:13
    |
 LL |             ASSUME_ALIGNMENT,
    |             ^^^^^^^^^^^^^^^^ expected `Assume`, found `bool`
 
-error: aborting due to 3 previous errors
+error: aborting due to 2 previous errors
 
 Some errors have detailed explanations: E0107, E0308.
 For more information about an error, try `rustc --explain E0107`.