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Disallow non-monomorphic calls to
needs_drop
in interpreter
otherwise evaluation could change after further substitutions.
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// Check that evaluation of needs_drop<T> fails when T is not monomorphic. | ||
#![feature(const_generics)] | ||
#![allow(const_evaluatable_unchecked)] | ||
#![allow(incomplete_features)] | ||
|
||
struct Bool<const B: bool> {} | ||
impl Bool<true> { | ||
fn assert() {} | ||
} | ||
fn f<T>() { | ||
Bool::<{ std::mem::needs_drop::<T>() }>::assert(); | ||
//~^ ERROR no function or associated item named `assert` found | ||
//~| ERROR constant expression depends on a generic parameter | ||
} | ||
fn main() { | ||
f::<u32>(); | ||
} |
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error[E0599]: no function or associated item named `assert` found for struct `Bool<{ std::mem::needs_drop::<T>() }>` in the current scope | ||
--> $DIR/const-needs_drop-monomorphic.rs:11:46 | ||
| | ||
LL | struct Bool<const B: bool> {} | ||
| -------------------------- function or associated item `assert` not found for this | ||
... | ||
LL | Bool::<{ std::mem::needs_drop::<T>() }>::assert(); | ||
| ^^^^^^ function or associated item cannot be called on `Bool<{ std::mem::needs_drop::<T>() }>` due to unsatisfied trait bounds | ||
|
||
error: constant expression depends on a generic parameter | ||
--> $DIR/const-needs_drop-monomorphic.rs:11:5 | ||
| | ||
LL | Bool::<{ std::mem::needs_drop::<T>() }>::assert(); | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
| | ||
= note: this may fail depending on what value the parameter takes | ||
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error: aborting due to 2 previous errors | ||
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For more information about this error, try `rustc --explain E0599`. |