Rollup merge of rust-lang#87134 - BoxyUwU:cgd-self-ty-error, r=lcnr

Make SelfInTyParamDefault wording not be specific to type defaults

r? ```@lcnr```

Author: JohnTitor

compiler/rustc_resolve/src/diagnostics.rs

@@ -502,14 +502,14 @@ impl<'a> Resolver<'a> {
 
                 err
             }
-            ResolutionError::SelfInTyParamDefault => {
+            ResolutionError::SelfInGenericParamDefault => {
                 let mut err = struct_span_err!(
                     self.session,
                     span,
                     E0735,
-                    "type parameters cannot use `Self` in their defaults"
+                    "generic parameters cannot use `Self` in their defaults"
                 );
-                err.span_label(span, "`Self` in type parameter default".to_string());
+                err.span_label(span, "`Self` in generic parameter default".to_string());
                 err
             }
             ResolutionError::UnreachableLabel { name, definition_span, suggestion } => {

compiler/rustc_resolve/src/lib.rs

@@ -249,7 +249,7 @@ enum ResolutionError<'a> {
     /// This error is only emitted when using `min_const_generics`.
     ParamInNonTrivialAnonConst { name: Symbol, is_type: bool },
     /// Error E0735: generic parameters with a default cannot use `Self`
-    SelfInTyParamDefault,
+    SelfInGenericParamDefault,
     /// Error E0767: use of unreachable label
     UnreachableLabel { name: Symbol, definition_span: Span, suggestion: Option<LabelSuggestion> },
 }
@@ -2643,7 +2643,7 @@ impl<'a> Resolver<'a> {
         if let ForwardGenericParamBanRibKind = all_ribs[rib_index].kind {
             if record_used {
                 let res_error = if rib_ident.name == kw::SelfUpper {
-                    ResolutionError::SelfInTyParamDefault
+                    ResolutionError::SelfInGenericParamDefault
                 } else {
                     ResolutionError::ForwardDeclaredGenericParam
                 };

src/test/ui/const-generics/defaults/default-const-param-cannot-reference-self.rs

@@ -0,0 +1,16 @@
+#![feature(const_generics_defaults)]
+
+struct Struct<const N: usize = { Self; 10 }>;
+//~^ ERROR generic parameters cannot use `Self` in their defaults [E0735]
+
+enum Enum<const N: usize = { Self; 10 }> { }
+//~^ ERROR generic parameters cannot use `Self` in their defaults [E0735]
+
+union Union<const N: usize = { Self; 10 }> { not_empty: () }
+//~^ ERROR generic parameters cannot use `Self` in their defaults [E0735]
+
+fn main() {
+    let _: Struct;
+    let _: Enum;
+    let _: Union;
+}

src/test/ui/const-generics/defaults/default-const-param-cannot-reference-self.stderr

@@ -0,0 +1,21 @@
+error[E0735]: generic parameters cannot use `Self` in their defaults
+  --> $DIR/default-const-param-cannot-reference-self.rs:3:34
+   |
+LL | struct Struct<const N: usize = { Self; 10 }>;
+   |                                  ^^^^ `Self` in generic parameter default
+
+error[E0735]: generic parameters cannot use `Self` in their defaults
+  --> $DIR/default-const-param-cannot-reference-self.rs:6:30
+   |
+LL | enum Enum<const N: usize = { Self; 10 }> { }
+   |                              ^^^^ `Self` in generic parameter default
+
+error[E0735]: generic parameters cannot use `Self` in their defaults
+  --> $DIR/default-const-param-cannot-reference-self.rs:9:32
+   |
+LL | union Union<const N: usize = { Self; 10 }> { not_empty: () }
+   |                                ^^^^ `Self` in generic parameter default
+
+error: aborting due to 3 previous errors
+
+For more information about this error, try `rustc --explain E0735`.

src/test/ui/generics/issue-61631-default-type-param-cannot-reference-self.rs

@@ -11,25 +11,25 @@
 // compatibility concern.
 
 struct Snobound<'a, P = Self> { x: Option<&'a P> }
-//~^ ERROR type parameters cannot use `Self` in their defaults [E0735]
+//~^ ERROR generic parameters cannot use `Self` in their defaults [E0735]
 
 enum Enobound<'a, P = Self> { A, B(Option<&'a P>) }
-//~^ ERROR type parameters cannot use `Self` in their defaults [E0735]
+//~^ ERROR generic parameters cannot use `Self` in their defaults [E0735]
 
 union Unobound<'a, P = Self> { x: i32, y: Option<&'a P> }
-//~^ ERROR type parameters cannot use `Self` in their defaults [E0735]
+//~^ ERROR generic parameters cannot use `Self` in their defaults [E0735]
 
 // Disallowing `Self` in defaults sidesteps need to check the bounds
 // on the defaults in cases like these.
 
 struct Ssized<'a, P: Sized = [Self]> { x: Option<&'a P> }
-//~^ ERROR type parameters cannot use `Self` in their defaults [E0735]
+//~^ ERROR generic parameters cannot use `Self` in their defaults [E0735]
 
 enum Esized<'a, P: Sized = [Self]> { A, B(Option<&'a P>) }
-//~^ ERROR type parameters cannot use `Self` in their defaults [E0735]
+//~^ ERROR generic parameters cannot use `Self` in their defaults [E0735]
 
 union Usized<'a, P: Sized = [Self]> { x: i32, y: Option<&'a P> }
-//~^ ERROR type parameters cannot use `Self` in their defaults [E0735]
+//~^ ERROR generic parameters cannot use `Self` in their defaults [E0735]
 
 fn demo_usages() {
     // An ICE means you only get the error from the first line of the

src/test/ui/generics/issue-61631-default-type-param-cannot-reference-self.stderr

@@ -1,38 +1,38 @@
-error[E0735]: type parameters cannot use `Self` in their defaults
+error[E0735]: generic parameters cannot use `Self` in their defaults
   --> $DIR/issue-61631-default-type-param-cannot-reference-self.rs:13:25
    |
 LL | struct Snobound<'a, P = Self> { x: Option<&'a P> }
-   |                         ^^^^ `Self` in type parameter default
+   |                         ^^^^ `Self` in generic parameter default
 
-error[E0735]: type parameters cannot use `Self` in their defaults
+error[E0735]: generic parameters cannot use `Self` in their defaults
   --> $DIR/issue-61631-default-type-param-cannot-reference-self.rs:16:23
    |
 LL | enum Enobound<'a, P = Self> { A, B(Option<&'a P>) }
-   |                       ^^^^ `Self` in type parameter default
+   |                       ^^^^ `Self` in generic parameter default
 
-error[E0735]: type parameters cannot use `Self` in their defaults
+error[E0735]: generic parameters cannot use `Self` in their defaults
   --> $DIR/issue-61631-default-type-param-cannot-reference-self.rs:19:24
    |
 LL | union Unobound<'a, P = Self> { x: i32, y: Option<&'a P> }
-   |                        ^^^^ `Self` in type parameter default
+   |                        ^^^^ `Self` in generic parameter default
 
-error[E0735]: type parameters cannot use `Self` in their defaults
+error[E0735]: generic parameters cannot use `Self` in their defaults
   --> $DIR/issue-61631-default-type-param-cannot-reference-self.rs:25:31
    |
 LL | struct Ssized<'a, P: Sized = [Self]> { x: Option<&'a P> }
-   |                               ^^^^ `Self` in type parameter default
+   |                               ^^^^ `Self` in generic parameter default
 
-error[E0735]: type parameters cannot use `Self` in their defaults
+error[E0735]: generic parameters cannot use `Self` in their defaults
   --> $DIR/issue-61631-default-type-param-cannot-reference-self.rs:28:29
    |
 LL | enum Esized<'a, P: Sized = [Self]> { A, B(Option<&'a P>) }
-   |                             ^^^^ `Self` in type parameter default
+   |                             ^^^^ `Self` in generic parameter default
 
-error[E0735]: type parameters cannot use `Self` in their defaults
+error[E0735]: generic parameters cannot use `Self` in their defaults
   --> $DIR/issue-61631-default-type-param-cannot-reference-self.rs:31:30
    |
 LL | union Usized<'a, P: Sized = [Self]> { x: i32, y: Option<&'a P> }
-   |                              ^^^^ `Self` in type parameter default
+   |                              ^^^^ `Self` in generic parameter default
 
 error: aborting due to 6 previous errors