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Add regression test for nested const arg ICE under mGCA #152406

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Add regression test for nested const arg ICE under mGCA #152406

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18 changes: 18 additions & 0 deletions tests/ui/const-generics/mgca/ice-143358-nested-const-arg.rs
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Original file line number Diff line number Diff line change
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//! Regression test for <https://github.com/rust-lang/rust/issues/143358>
//!
//! Using deeply nested const generic function calls in the type position of a
//! const parameter with both `generic_const_exprs` and `min_generic_const_args`
//! used to ICE with "unhandled node ConstArg" in `generics_of`.
//! Fixed by <https://github.com/rust-lang/rust/pull/149136>.

#![feature(generic_const_exprs)]
//~^ WARN the feature `generic_const_exprs` is incomplete
#![feature(min_generic_const_args)]
//~^ WARN the feature `min_generic_const_args` is incomplete

fn identity<const T: identity<{ identity::<{ identity::<{}> }>() }>>();
//~^ ERROR free function without a body
//~| ERROR expected type, found function `identity`
//~| ERROR complex const arguments must be placed inside of a `const` block

fn main() {}
40 changes: 40 additions & 0 deletions tests/ui/const-generics/mgca/ice-143358-nested-const-arg.stderr
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error: free function without a body
--> $DIR/ice-143358-nested-const-arg.rs:13:1
|
LL | fn identity<const T: identity<{ identity::<{ identity::<{}> }>() }>>();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-
| |
| help: provide a definition for the function: `{ <body> }`

error[E0573]: expected type, found function `identity`
--> $DIR/ice-143358-nested-const-arg.rs:13:22
|
LL | fn identity<const T: identity<{ identity::<{ identity::<{}> }>() }>>();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not a type

warning: the feature `generic_const_exprs` is incomplete and may not be safe to use and/or cause compiler crashes
--> $DIR/ice-143358-nested-const-arg.rs:8:12
|
LL | #![feature(generic_const_exprs)]
| ^^^^^^^^^^^^^^^^^^^
|
= note: see issue #76560 <https://github.com/rust-lang/rust/issues/76560> for more information
= note: `#[warn(incomplete_features)]` on by default

warning: the feature `min_generic_const_args` is incomplete and may not be safe to use and/or cause compiler crashes
--> $DIR/ice-143358-nested-const-arg.rs:10:12
|
LL | #![feature(min_generic_const_args)]
| ^^^^^^^^^^^^^^^^^^^^^^
|
= note: see issue #132980 <https://github.com/rust-lang/rust/issues/132980> for more information

error: complex const arguments must be placed inside of a `const` block
--> $DIR/ice-143358-nested-const-arg.rs:13:57
|
LL | fn identity<const T: identity<{ identity::<{ identity::<{}> }>() }>>();
| ^^

error: aborting due to 3 previous errors; 2 warnings emitted

For more information about this error, try `rustc --explain E0573`.
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