wip on constargkind::path for all paths

lots of ICEs and other bad changes

compiler/rustc_ast_lowering/src/lib.rs

@@ -2334,14 +2334,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         } else {
             &anon.value
         };
-        let maybe_res =
-            self.resolver.get_partial_res(expr.id).and_then(|partial_res| partial_res.full_res());
-        debug!("res={:?}", maybe_res);
-        // FIXME(min_generic_const_args): for now we only lower params to ConstArgKind::Path
-        if let Some(res) = maybe_res
-            && let Res::Def(DefKind::ConstParam, _) = res
-            && let ExprKind::Path(qself, path) = &expr.kind
-        {
+        if let ExprKind::Path(qself, path) = &expr.kind {
             let qpath = self.lower_qpath(
                 expr.id,
                 qself,

tests/ui/const-generics/bad-generic-in-copy-impl.stderr

@@ -1,17 +1,36 @@
-error[E0308]: mismatched types
-  --> $DIR/bad-generic-in-copy-impl.rs:3:13
+error: the constant `1` is not of type `usize`
+  --> $DIR/bad-generic-in-copy-impl.rs:3:8
    |
 LL |     x: [u8; SIZE],
-   |             ^^^^ expected `usize`, found `u32`
+   |        ^^^^^^^^^^ expected `usize`, found `u32`
 
-error[E0308]: mismatched types
-  --> $DIR/bad-generic-in-copy-impl.rs:3:13
+error[E0204]: the trait `Copy` cannot be implemented for this type
+  --> $DIR/bad-generic-in-copy-impl.rs:1:10
    |
+LL | #[derive(Copy, Clone)]
+   |          ^^^^
+LL | pub struct Foo {
 LL |     x: [u8; SIZE],
-   |             ^^^^ expected `usize`, found `u32`
+   |     ------------- this field does not implement `Copy`
    |
-   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
+note: the `Copy` impl for `[u8; 1]` requires that `the constant `1` has type `usize``
+  --> $DIR/bad-generic-in-copy-impl.rs:3:8
+   |
+LL |     x: [u8; SIZE],
+   |        ^^^^^^^^^^
+   = note: this error originates in the derive macro `Copy` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: the constant `1` is not of type `usize`
+  --> $DIR/bad-generic-in-copy-impl.rs:3:5
+   |
+LL | #[derive(Copy, Clone)]
+   |                ----- in this derive macro expansion
+LL | pub struct Foo {
+LL |     x: [u8; SIZE],
+   |     ^^^^^^^^^^^^^ expected `usize`, found `u32`
+   |
+   = note: this error originates in the derive macro `Clone` (in Nightly builds, run with -Z macro-backtrace for more info)
 
-error: aborting due to 2 previous errors
+error: aborting due to 3 previous errors
 
-For more information about this error, try `rustc --explain E0308`.
+For more information about this error, try `rustc --explain E0204`.

tests/ui/const-generics/const-param-type-depends-on-const-param.min.stderr

@@ -14,30 +14,6 @@ LL | pub struct SelfDependent<const N: [u8; N]>;
    |
    = note: const parameters may not be used in the type of const parameters
 
-error: `[u8; N]` is forbidden as the type of a const generic parameter
-  --> $DIR/const-param-type-depends-on-const-param.rs:11:47
-   |
-LL | pub struct Dependent<const N: usize, const X: [u8; N]>([(); N]);
-   |                                               ^^^^^^^
-   |
-   = note: the only supported types are integers, `bool`, and `char`
-help: add `#![feature(adt_const_params)]` to the crate attributes to enable more complex and user defined types
-   |
-LL + #![feature(adt_const_params)]
-   |
-
-error: `[u8; N]` is forbidden as the type of a const generic parameter
-  --> $DIR/const-param-type-depends-on-const-param.rs:15:35
-   |
-LL | pub struct SelfDependent<const N: [u8; N]>;
-   |                                   ^^^^^^^
-   |
-   = note: the only supported types are integers, `bool`, and `char`
-help: add `#![feature(adt_const_params)]` to the crate attributes to enable more complex and user defined types
-   |
-LL + #![feature(adt_const_params)]
-   |
-
-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/fn-const-param-infer.adt_const_params.stderr

@@ -4,16 +4,6 @@ error[E0741]: using function pointers as const generic parameters is forbidden
 LL | struct Checked<const F: fn(usize) -> bool>;
    |                         ^^^^^^^^^^^^^^^^^
 
-error[E0308]: mismatched types
-  --> $DIR/fn-const-param-infer.rs:33:25
-   |
-LL |     let _ = Checked::<{ generic_arg::<u32> }>;
-   |                         ^^^^^^^^^^^^^^^^^^ expected fn pointer, found fn item
-   |
-   = note: expected fn pointer `fn(usize) -> _`
-                 found fn item `fn(u32) -> _ {generic_arg::<u32>}`
-
-error: aborting due to 2 previous errors
+error: aborting due to 1 previous error
 
-Some errors have detailed explanations: E0308, E0741.
-For more information about an error, try `rustc --explain E0308`.
+For more information about this error, try `rustc --explain E0741`.

tests/ui/const-generics/fn-const-param-infer.full.stderr

@@ -4,16 +4,6 @@ error[E0741]: using function pointers as const generic parameters is forbidden
 LL | struct Checked<const F: fn(usize) -> bool>;
    |                         ^^^^^^^^^^^^^^^^^
 
-error[E0308]: mismatched types
-  --> $DIR/fn-const-param-infer.rs:33:25
-   |
-LL |     let _ = Checked::<{ generic_arg::<u32> }>;
-   |                         ^^^^^^^^^^^^^^^^^^ expected fn pointer, found fn item
-   |
-   = note: expected fn pointer `fn(usize) -> _`
-                 found fn item `fn(u32) -> _ {generic_arg::<u32>}`
-
-error: aborting due to 2 previous errors
+error: aborting due to 1 previous error
 
-Some errors have detailed explanations: E0308, E0741.
-For more information about an error, try `rustc --explain E0308`.
+For more information about this error, try `rustc --explain E0741`.

tests/ui/const-generics/fn-const-param-infer.min.stderr

@@ -6,15 +6,5 @@ LL | struct Checked<const F: fn(usize) -> bool>;
    |
    = note: the only supported types are integers, `bool`, and `char`
 
-error[E0308]: mismatched types
-  --> $DIR/fn-const-param-infer.rs:33:25
-   |
-LL |     let _ = Checked::<{ generic_arg::<u32> }>;
-   |                         ^^^^^^^^^^^^^^^^^^ expected fn pointer, found fn item
-   |
-   = note: expected fn pointer `fn(usize) -> _`
-                 found fn item `fn(u32) -> _ {generic_arg::<u32>}`
-
-error: aborting due to 2 previous errors
+error: aborting due to 1 previous error
 
-For more information about this error, try `rustc --explain E0308`.

tests/ui/const-generics/generic_const_exprs/error_in_ty.stderr

@@ -6,30 +6,6 @@ LL | pub struct A<const z: [usize; x]> {}
    |                    |
    |                    similarly named const parameter `z` defined here
 
-error: `[usize; x]` is forbidden as the type of a const generic parameter
-  --> $DIR/error_in_ty.rs:6:23
-   |
-LL | pub struct A<const z: [usize; x]> {}
-   |                       ^^^^^^^^^^
-   |
-   = note: the only supported types are integers, `bool`, and `char`
-help: add `#![feature(adt_const_params)]` to the crate attributes to enable more complex and user defined types
-   |
-LL + #![feature(adt_const_params)]
-   |
-
-error[E0308]: mismatched types
-  --> $DIR/error_in_ty.rs:10:8
-   |
-LL | impl A<2> {
-   |        ^ expected `[usize; x]`, found integer
-
-error[E0308]: mismatched types
-  --> $DIR/error_in_ty.rs:16:8
-   |
-LL | impl A<2> {
-   |        ^ expected `[usize; x]`, found integer
-
 error[E0592]: duplicate definitions with name `B`
   --> $DIR/error_in_ty.rs:12:5
    |
@@ -39,7 +15,7 @@ LL |     pub const fn B() {}
 LL |     pub const fn B() {}
    |     ---------------- other definition for `B`
 
-error: aborting due to 5 previous errors
+error: aborting due to 2 previous errors
 
-Some errors have detailed explanations: E0308, E0425, E0592.
-For more information about an error, try `rustc --explain E0308`.
+Some errors have detailed explanations: E0425, E0592.
+For more information about an error, try `rustc --explain E0425`.

tests/ui/const-generics/generic_const_exprs/issue-62504.full.stderr

@@ -1,23 +1,3 @@
-error[E0308]: mismatched types
-  --> $DIR/issue-62504.rs:18:21
-   |
-LL |         ArrayHolder([0; Self::SIZE])
-   |                     ^^^^^^^^^^^^^^^ expected `X`, found `Self::SIZE`
-   |
-   = note: expected constant `X`
-              found constant `Self::SIZE`
-
-error: unconstrained generic constant
-  --> $DIR/issue-62504.rs:18:25
-   |
-LL |         ArrayHolder([0; Self::SIZE])
-   |                         ^^^^^^^^^^
-   |
-help: try adding a `where` bound
-   |
-LL |     pub const fn new() -> Self where [(); Self::SIZE]: {
-   |                                +++++++++++++++++++++++
-
 error[E0284]: type annotations needed for `ArrayHolder<_>`
   --> $DIR/issue-62504.rs:26:9
    |
@@ -52,7 +32,6 @@ help: consider giving `array` an explicit type, where the value of const paramet
 LL |     let mut array: ArrayHolder<X> = ArrayHolder::new();
    |                  ++++++++++++++++
 
-error: aborting due to 4 previous errors
+error: aborting due to 2 previous errors
 
-Some errors have detailed explanations: E0284, E0308.
-For more information about an error, try `rustc --explain E0284`.
+For more information about this error, try `rustc --explain E0284`.

tests/ui/const-generics/generic_const_exprs/issue-62504.min.stderr

@@ -1,27 +1,3 @@
-error: constant expression depends on a generic parameter
-  --> $DIR/issue-62504.rs:18:25
-   |
-LL |         ArrayHolder([0; Self::SIZE])
-   |                         ^^^^^^^^^^
-   |
-   = note: this may fail depending on what value the parameter takes
-
-error[E0308]: mismatched types
-  --> $DIR/issue-62504.rs:18:21
-   |
-LL |         ArrayHolder([0; Self::SIZE])
-   |         ----------- ^^^^^^^^^^^^^^^ expected `X`, found `Self::SIZE`
-   |         |
-   |         arguments to this struct are incorrect
-   |
-   = note: expected array `[u32; X]`
-              found array `[u32; Self::SIZE]`
-note: tuple struct defined here
-  --> $DIR/issue-62504.rs:14:8
-   |
-LL | struct ArrayHolder<const X: usize>([u32; X]);
-   |        ^^^^^^^^^^^
-
 error[E0284]: type annotations needed for `ArrayHolder<_>`
   --> $DIR/issue-62504.rs:26:9
    |
@@ -56,7 +32,6 @@ help: consider giving `array` an explicit type, where the value of const paramet
 LL |     let mut array: ArrayHolder<X> = ArrayHolder::new();
    |                  ++++++++++++++++
 
-error: aborting due to 4 previous errors
+error: aborting due to 2 previous errors
 
-Some errors have detailed explanations: E0284, E0308.
-For more information about an error, try `rustc --explain E0284`.
+For more information about this error, try `rustc --explain E0284`.

tests/ui/const-generics/issues/issue-62878.min.stderr

@@ -6,18 +6,6 @@ LL | fn foo<const N: usize, const A: [u8; N]>() {}
    |
    = note: const parameters may not be used in the type of const parameters
 
-error: `[u8; N]` is forbidden as the type of a const generic parameter
-  --> $DIR/issue-62878.rs:5:33
-   |
-LL | fn foo<const N: usize, const A: [u8; N]>() {}
-   |                                 ^^^^^^^
-   |
-   = note: the only supported types are integers, `bool`, and `char`
-help: add `#![feature(adt_const_params)]` to the crate attributes to enable more complex and user defined types
-   |
-LL + #![feature(adt_const_params)]
-   |
-
 error[E0747]: type provided when a constant was expected
   --> $DIR/issue-62878.rs:10:11
    |
@@ -30,7 +18,7 @@ help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable
 LL + #![feature(generic_arg_infer)]
    |
 
-error: aborting due to 3 previous errors
+error: aborting due to 2 previous errors
 
 Some errors have detailed explanations: E0747, E0770.
 For more information about an error, try `rustc --explain E0747`.

tests/ui/const-generics/issues/issue-71169.min.stderr

@@ -6,18 +6,6 @@ LL | fn foo<const LEN: usize, const DATA: [u8; LEN]>() {}
    |
    = note: const parameters may not be used in the type of const parameters
 
-error: `[u8; LEN]` is forbidden as the type of a const generic parameter
-  --> $DIR/issue-71169.rs:5:38
-   |
-LL | fn foo<const LEN: usize, const DATA: [u8; LEN]>() {}
-   |                                      ^^^^^^^^^
-   |
-   = note: the only supported types are integers, `bool`, and `char`
-help: add `#![feature(adt_const_params)]` to the crate attributes to enable more complex and user defined types
-   |
-LL + #![feature(adt_const_params)]
-   |
-
-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/not_wf_param_in_rpitit.stderr

@@ -18,29 +18,6 @@ LL | trait Trait<const N: dyn Trait = bar> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
 
-error[E0038]: the trait `Trait` cannot be made into an object
-  --> $DIR/not_wf_param_in_rpitit.rs:3:22
-   |
-LL | trait Trait<const N: dyn Trait = bar> {
-   |                      ^^^^^^^^^ `Trait` cannot be made into an object
-   |
-note: for a trait to be "dyn-compatible" 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/not_wf_param_in_rpitit.rs:9:14
-   |
-LL | trait Trait<const N: dyn Trait = bar> {
-   |       ----- this trait cannot be made into an object...
-...
-LL |     async fn a() {}
-   |              ^ ...because associated function `a` has no `self` parameter
-help: consider turning `a` into a method by giving it a `&self` argument
-   |
-LL |     async fn a(&self) {}
-   |                +++++
-help: alternatively, consider constraining `a` so it does not apply to trait objects
-   |
-LL |     async fn a() where Self: Sized {}
-   |                  +++++++++++++++++
-
 error[E0038]: the trait `Trait` cannot be made into an object
   --> $DIR/not_wf_param_in_rpitit.rs:3:13
    |
@@ -88,7 +65,7 @@ help: alternatively, consider constraining `a` so it does not apply to trait obj
 LL |     async fn a() where Self: Sized {}
    |                  +++++++++++++++++
 
-error: aborting due to 5 previous errors
+error: aborting due to 4 previous errors
 
 Some errors have detailed explanations: E0038, E0391, E0425.
 For more information about an error, try `rustc --explain E0038`.

tests/ui/consts/const-len-underflow-separate-spans.old.stderr

@@ -4,12 +4,6 @@ error[E0080]: evaluation of constant value failed
 LL | const LEN: usize = ONE - TWO;
    |                    ^^^^^^^^^ attempt to compute `1_usize - 2_usize`, which would overflow
 
-note: erroneous constant encountered
-  --> $DIR/const-len-underflow-separate-spans.rs:14:17
-   |
-LL |     let a: [i8; LEN] = unimplemented!();
-   |                 ^^^
-
 error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0080`.

tests/ui/consts/issue-39974.stderr

@@ -9,12 +9,6 @@ help: use a float literal
 LL | const LENGTH: f64 = 2.0;
    |                      ++
 
-error[E0308]: mismatched types
-  --> $DIR/issue-39974.rs:5:19
-   |
-LL |     f: [[f64; 2]; LENGTH],
-   |                   ^^^^^^ expected `usize`, found `f64`
-
-error: aborting due to 2 previous errors
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0308`.

tests/ui/extern/extern-static-size-overflow.stderr

@@ -4,17 +4,5 @@ error: extern static is too large for the target architecture
 LL |     static BAZ: [u8; max_size()];
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: extern static is too large for the target architecture
-  --> $DIR/extern-static-size-overflow.rs:21:5
-   |
-LL |     static UWU: [usize; usize::MAX];
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-error: extern static is too large for the target architecture
-  --> $DIR/extern-static-size-overflow.rs:22:5
-   |
-LL |     static A: ReallyBig;
-   |     ^^^^^^^^^^^^^^^^^^^
-
-error: aborting due to 3 previous errors
+error: aborting due to 1 previous error