Silence follow up errors if astconv already errored

compiler/rustc_hir_analysis/src/astconv/mod.rs

@@ -390,6 +390,12 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
             infer_args,
         );
 
+        if let Err(err) = &arg_count.correct
+            && let Some(reported) = err.reported
+        {
+            self.set_tainted_by_errors(reported);
+        }
+
         // Skip processing if type has no generic parameters.
         // Traits always have `Self` as a generic parameter, which means they will not return early
         // here and so associated type bindings will be handled regardless of whether there are any
@@ -568,6 +574,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
                 span,
                 modifier: constness.as_str(),
             });
+            self.set_tainted_by_errors(e);
             arg_count.correct =
                 Err(GenericArgCountMismatch { reported: Some(e), invalid_args: vec![] });
         }

compiler/rustc_hir_analysis/src/collect.rs

@@ -35,6 +35,7 @@ use rustc_target::spec::abi;
 use rustc_trait_selection::infer::InferCtxtExt;
 use rustc_trait_selection::traits::error_reporting::suggestions::NextTypeParamName;
 use rustc_trait_selection::traits::ObligationCtxt;
+use std::cell::Cell;
 use std::iter;
 use std::ops::Bound;
 
@@ -119,6 +120,7 @@ pub fn provide(providers: &mut Providers) {
 pub struct ItemCtxt<'tcx> {
     tcx: TyCtxt<'tcx>,
     item_def_id: LocalDefId,
+    tainted_by_errors: Cell<Option<ErrorGuaranteed>>,
 }
 
 ///////////////////////////////////////////////////////////////////////////
@@ -343,7 +345,7 @@ fn bad_placeholder<'tcx>(
 
 impl<'tcx> ItemCtxt<'tcx> {
     pub fn new(tcx: TyCtxt<'tcx>, item_def_id: LocalDefId) -> ItemCtxt<'tcx> {
-        ItemCtxt { tcx, item_def_id }
+        ItemCtxt { tcx, item_def_id, tainted_by_errors: Cell::new(None) }
     }
 
     pub fn to_ty(&self, ast_ty: &hir::Ty<'_>) -> Ty<'tcx> {
@@ -357,6 +359,13 @@ impl<'tcx> ItemCtxt<'tcx> {
     pub fn node(&self) -> hir::Node<'tcx> {
         self.tcx.hir_node(self.hir_id())
     }
+
+    fn check_tainted_by_errors(&self) -> Result<(), ErrorGuaranteed> {
+        match self.tainted_by_errors.get() {
+            Some(err) => Err(err),
+            None => Ok(()),
+        }
+    }
 }
 
 impl<'tcx> AstConv<'tcx> for ItemCtxt<'tcx> {
@@ -492,8 +501,8 @@ impl<'tcx> AstConv<'tcx> for ItemCtxt<'tcx> {
         ty.ty_adt_def()
     }
 
-    fn set_tainted_by_errors(&self, _: ErrorGuaranteed) {
-        // There's no obvious place to track this, so just let it go.
+    fn set_tainted_by_errors(&self, err: ErrorGuaranteed) {
+        self.tainted_by_errors.set(Some(err));
     }
 
     fn record_ty(&self, _hir_id: hir::HirId, _ty: Ty<'tcx>, _span: Span) {

compiler/rustc_hir_analysis/src/collect/type_of.rs

@@ -513,7 +513,11 @@ pub(super) fn type_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::EarlyBinder<Ty
             bug!("unexpected sort of node in type_of(): {:?}", x);
         }
     };
-    ty::EarlyBinder::bind(output)
+    if let Err(e) = icx.check_tainted_by_errors() {
+        ty::EarlyBinder::bind(Ty::new_error(tcx, e))
+    } else {
+        ty::EarlyBinder::bind(output)
+    }
 }
 
 pub(super) fn type_of_opaque(

tests/ui/associated-inherent-types/issue-109071.no_gate.stderr

@@ -30,7 +30,7 @@ LL |     type Item = &[T];
    = help: add `#![feature(inherent_associated_types)]` to the crate attributes to enable
 
 error[E0223]: ambiguous associated type
-  --> $DIR/issue-109071.rs:16:22
+  --> $DIR/issue-109071.rs:15:22
    |
 LL |     fn T() -> Option<Self::Item> {}
    |                      ^^^^^^^^^^

tests/ui/associated-inherent-types/issue-109071.rs

@@ -9,13 +9,11 @@ impl<T> Windows { //~ ERROR: missing generics for struct `Windows`
     //[no_gate]~^ ERROR: inherent associated types are unstable
 
     fn next() -> Option<Self::Item> {}
-    //[with_gate]~^ ERROR type annotations needed
 }
 
 impl<T> Windows<T> {
     fn T() -> Option<Self::Item> {}
-    //[no_gate]~^ ERROR: ambiguous associated type
-    //[with_gate]~^^ ERROR type annotations needed
+    //~^ ERROR: ambiguous associated type
 }
 
 fn main() {}

tests/ui/associated-inherent-types/issue-109071.with_gate.stderr

@@ -20,19 +20,20 @@ help: add missing generic argument
 LL | impl<T> Windows<T> {
    |                +++
 
-error[E0282]: type annotations needed
-  --> $DIR/issue-109071.rs:11:18
-   |
-LL |     fn next() -> Option<Self::Item> {}
-   |                  ^^^^^^^^^^^^^^^^^^ cannot infer type for type parameter `T`
-
-error[E0282]: type annotations needed
-  --> $DIR/issue-109071.rs:16:15
+error[E0223]: ambiguous associated type
+  --> $DIR/issue-109071.rs:15:22
    |
 LL |     fn T() -> Option<Self::Item> {}
-   |               ^^^^^^^^^^^^^^^^^^ cannot infer type for type parameter `T`
+   |                      ^^^^^^^^^^
+   |
+help: use fully-qualified syntax
+   |
+LL |     fn T() -> Option<<Windows<T> as IntoAsyncIterator>::Item> {}
+   |                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+LL |     fn T() -> Option<<Windows<T> as IntoIterator>::Item> {}
+   |                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-error: aborting due to 4 previous errors
+error: aborting due to 3 previous errors
 
-Some errors have detailed explanations: E0107, E0282, E0637.
+Some errors have detailed explanations: E0107, E0223, E0637.
 For more information about an error, try `rustc --explain E0107`.

tests/ui/const-generics/issues/issue-71381.full.stderr

@@ -7,7 +7,7 @@ LL |     pub fn call_me<Args: Sized, const IDX: usize, const FN: unsafe extern "
    = note: type parameters may not be used in the type of const parameters
 
 error[E0770]: the type of const parameters must not depend on other generic parameters
-  --> $DIR/issue-71381.rs:23:40
+  --> $DIR/issue-71381.rs:22:40
    |
 LL |         const FN: unsafe extern "C" fn(Args),
    |                                        ^^^^ the type must not depend on the parameter `Args`

tests/ui/const-generics/issues/issue-71381.min.stderr

@@ -7,29 +7,13 @@ LL |     pub fn call_me<Args: Sized, const IDX: usize, const FN: unsafe extern "
    = note: type parameters may not be used in the type of const parameters
 
 error[E0770]: the type of const parameters must not depend on other generic parameters
-  --> $DIR/issue-71381.rs:23:40
+  --> $DIR/issue-71381.rs:22:40
    |
 LL |         const FN: unsafe extern "C" fn(Args),
    |                                        ^^^^ the type must not depend on the parameter `Args`
    |
    = note: type parameters may not be used in the type of const parameters
 
-error: using function pointers as const generic parameters is forbidden
-  --> $DIR/issue-71381.rs:14:61
-   |
-LL |     pub fn call_me<Args: Sized, const IDX: usize, const FN: unsafe extern "C" fn(Args)>(&self) {
-   |                                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: the only supported types are integers, `bool` and `char`
-
-error: using function pointers as const generic parameters is forbidden
-  --> $DIR/issue-71381.rs:23:19
-   |
-LL |         const FN: unsafe extern "C" fn(Args),
-   |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: the only supported types are integers, `bool` and `char`
-
-error: aborting due to 4 previous errors
+error: aborting due to 2 previous errors
 
 For more information about this error, try `rustc --explain E0770`.

tests/ui/const-generics/issues/issue-71381.rs

@@ -12,17 +12,15 @@ unsafe extern "C" fn pass(args: PassArg) {
 
 impl Test {
     pub fn call_me<Args: Sized, const IDX: usize, const FN: unsafe extern "C" fn(Args)>(&self) {
-        //[min]~^ ERROR: using function pointers as const generic parameters is forbidden
-        //~^^ ERROR: the type of const parameters must not depend on other generic parameters
+        //~^ ERROR: the type of const parameters must not depend on other generic parameters
         self.0 = Self::trampiline::<Args, IDX, FN> as _
     }
 
     unsafe extern "C" fn trampiline<
         Args: Sized,
         const IDX: usize,
         const FN: unsafe extern "C" fn(Args),
-        //[min]~^ ERROR: using function pointers as const generic parameters is forbidden
-        //~^^ ERROR: the type of const parameters must not depend on other generic parameters
+        //~^ ERROR: the type of const parameters must not depend on other generic parameters
     >(
         args: Args,
     ) {

tests/ui/const-generics/issues/issue-71611.min.stderr

@@ -6,14 +6,6 @@ LL | fn func<A, const F: fn(inner: A)>(outer: A) {
    |
    = note: type parameters may not be used in the type of const parameters
 
-error: using function pointers as const generic parameters is forbidden
-  --> $DIR/issue-71611.rs:5:21
-   |
-LL | fn func<A, const F: fn(inner: A)>(outer: A) {
-   |                     ^^^^^^^^^^^^
-   |
-   = note: the only supported types are integers, `bool` and `char`
-
-error: aborting due to 2 previous errors
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0770`.

tests/ui/const-generics/issues/issue-71611.rs

@@ -3,8 +3,7 @@
 #![cfg_attr(full, allow(incomplete_features))]
 
 fn func<A, const F: fn(inner: A)>(outer: A) {
-    //[min]~^ ERROR: using function pointers as const generic parameters is forbidden
-    //~^^ ERROR: the type of const parameters must not depend on other generic parameters
+    //~^ ERROR: the type of const parameters must not depend on other generic parameters
     F(outer);
 }
 

tests/ui/generic-associated-types/issue-71176.rs

@@ -9,9 +9,6 @@ impl Provider for () {
 struct Holder<B> {
   inner: Box<dyn Provider<A = B>>,
   //~^ ERROR: missing generics for associated type
-  //~| ERROR: missing generics for associated type
-  //~| ERROR: missing generics for associated type
-  //~| ERROR: the trait `Provider` cannot be made into an object
 }
 
 fn main() {

tests/ui/generic-associated-types/issue-71176.stderr

@@ -14,57 +14,6 @@ help: add missing lifetime argument
 LL |   inner: Box<dyn Provider<A<'a> = B>>,
    |                            ++++
 
-error[E0107]: missing generics for associated type `Provider::A`
-  --> $DIR/issue-71176.rs:10:27
-   |
-LL |   inner: Box<dyn Provider<A = B>>,
-   |                           ^ expected 1 lifetime argument
-   |
-note: associated type defined here, with 1 lifetime parameter: `'a`
-  --> $DIR/issue-71176.rs:2:10
-   |
-LL |     type A<'a>;
-   |          ^ --
-   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
-help: add missing lifetime argument
-   |
-LL |   inner: Box<dyn Provider<A<'a> = B>>,
-   |                            ++++
-
-error[E0107]: missing generics for associated type `Provider::A`
-  --> $DIR/issue-71176.rs:10:27
-   |
-LL |   inner: Box<dyn Provider<A = B>>,
-   |                           ^ expected 1 lifetime argument
-   |
-note: associated type defined here, with 1 lifetime parameter: `'a`
-  --> $DIR/issue-71176.rs:2:10
-   |
-LL |     type A<'a>;
-   |          ^ --
-   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
-help: add missing lifetime argument
-   |
-LL |   inner: Box<dyn Provider<A<'a> = B>>,
-   |                            ++++
-
-error[E0038]: the trait `Provider` cannot be made into an object
-  --> $DIR/issue-71176.rs:10:14
-   |
-LL |   inner: Box<dyn Provider<A = B>>,
-   |              ^^^^^^^^^^^^^^^^^^^ `Provider` cannot be made into an object
-   |
-note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
-  --> $DIR/issue-71176.rs:2:10
-   |
-LL | trait Provider {
-   |       -------- this trait cannot be made into an object...
-LL |     type A<'a>;
-   |          ^ ...because it contains the generic associated type `A`
-   = help: consider moving `A` to another trait
-   = help: only type `()` implements the trait, consider using it directly instead
-
-error: aborting due to 4 previous errors
+error: aborting due to 1 previous error
 
-Some errors have detailed explanations: E0038, E0107.
-For more information about an error, try `rustc --explain E0038`.
+For more information about this error, try `rustc --explain E0107`.

tests/ui/issues/issue-3214.rs

@@ -5,7 +5,6 @@ fn foo<T>() {
 
     impl<T> Drop for Foo<T> {
         //~^ ERROR struct takes 0 generic arguments but 1 generic argument
-        //~| ERROR `T` is not constrained
         fn drop(&mut self) {}
     }
 }

tests/ui/issues/issue-3214.stderr

@@ -22,13 +22,7 @@ note: struct defined here, with 0 generic parameters
 LL |     struct Foo {
    |            ^^^
 
-error[E0207]: the type parameter `T` is not constrained by the impl trait, self type, or predicates
-  --> $DIR/issue-3214.rs:6:10
-   |
-LL |     impl<T> Drop for Foo<T> {
-   |          ^ unconstrained type parameter
-
-error: aborting due to 3 previous errors
+error: aborting due to 2 previous errors
 
-Some errors have detailed explanations: E0107, E0207, E0401.
+Some errors have detailed explanations: E0107, E0401.
 For more information about an error, try `rustc --explain E0107`.

tests/ui/layout/issue-84108.rs

@@ -8,8 +8,6 @@ static FOO: (dyn AsRef<OsStr>, u8) = ("hello", 42);
 
 const BAR: (&Path, [u8], usize) = ("hello", [], 42);
 //~^ ERROR cannot find type `Path` in this scope
-//~| ERROR the size for values of type `[u8]` cannot be known at compilation time
-//~| ERROR mismatched types
 
 static BAZ: ([u8], usize) = ([], 0);
 //~^ ERROR the size for values of type `[u8]` cannot be known at compilation time

tests/ui/layout/issue-84108.stderr

@@ -21,25 +21,7 @@ LL + use std::path::Path;
    |
 
 error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
-  --> $DIR/issue-84108.rs:9:12
-   |
-LL | const BAR: (&Path, [u8], usize) = ("hello", [], 42);
-   |            ^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
-   |
-   = help: the trait `Sized` is not implemented for `[u8]`
-   = note: only the last element of a tuple may have a dynamically sized type
-
-error[E0308]: mismatched types
-  --> $DIR/issue-84108.rs:9:45
-   |
-LL | const BAR: (&Path, [u8], usize) = ("hello", [], 42);
-   |                                             ^^ expected `[u8]`, found `[_; 0]`
-   |
-   = note: expected slice `[u8]`
-              found array `[_; 0]`
-
-error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
-  --> $DIR/issue-84108.rs:14:13
+  --> $DIR/issue-84108.rs:12:13
    |
 LL | static BAZ: ([u8], usize) = ([], 0);
    |             ^^^^^^^^^^^^^ doesn't have a size known at compile-time
@@ -48,15 +30,15 @@ LL | static BAZ: ([u8], usize) = ([], 0);
    = note: only the last element of a tuple may have a dynamically sized type
 
 error[E0308]: mismatched types
-  --> $DIR/issue-84108.rs:14:30
+  --> $DIR/issue-84108.rs:12:30
    |
 LL | static BAZ: ([u8], usize) = ([], 0);
    |                              ^^ expected `[u8]`, found `[_; 0]`
    |
    = note: expected slice `[u8]`
               found array `[_; 0]`
 
-error: aborting due to 6 previous errors
+error: aborting due to 4 previous errors
 
 Some errors have detailed explanations: E0277, E0308, E0412.
 For more information about an error, try `rustc --explain E0277`.

tests/ui/parser/issues/issue-103748-ICE-wrong-braces.rs

@@ -5,4 +5,3 @@ struct Apple((Apple, Option(Banana ? Citron)));
 //~| ERROR expected one of `)` or `,`, found `Citron`
 //~| ERROR cannot find type `Citron` in this scope [E0412]
 //~| ERROR parenthesized type parameters may only be used with a `Fn` trait [E0214]
-//~| ERROR recursive type `Apple` has infinite size [E0072]