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Add regression test for #81899

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	`1`	`+// Regression test for #81899.`
	`2`	+// The `panic!()` below is important to trigger the fixed ICE.
	`3`	`+`
	`4`	`+const _CONST: &[u8] = &f(&[], \|_\| {});`
	`5`	`+`
	`6`	`+const fn f<F>(_: &[u8], _: F) -> &[u8]`
	`7`	`+where`
	`8`	`+ F: FnMut(&u8),`
	`9`	`+{`
	`10`	`+ panic!() //~ ERROR: evaluation of constant value failed`
	`11`	`+}`
	`12`	`+`
	`13`	`+fn main() {}`

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	`1`	`+error[E0080]: evaluation of constant value failed`
	`2`	`+ --> $DIR/issue-81899.rs:10:5`
	`3`	`+ \|`
	`4`	`+LL \| const _CONST: &[u8] = &f(&[], \|_\| {});`
	`5`	+ \| -------------- inside `_CONST` at $DIR/issue-81899.rs:4:24
	`6`	`+...`
	`7`	`+LL \| panic!()`
	`8`	`+ \| ^^^^^^^^`
	`9`	`+ \| \|`
	`10`	`+ \| the evaluated program panicked at 'explicit panic', $DIR/issue-81899.rs:10:5`
	`11`	+ \| inside `f::<[closure@$DIR/issue-81899.rs:4:31: 4:37]>` at $SRC_DIR/std/src/panic.rs:LL:COL
	`12`	`+ \|`
	`13`	+ = note: this error originates in the macro `$crate::panic::panic_2015` (in Nightly builds, run with -Z macro-backtrace for more info)
	`14`	`+`
	`15`	`+error: aborting due to previous error`
	`16`	`+`
	`17`	+For more information about this error, try `rustc --explain E0080`.

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