Change:
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NB: Only panics for me with the flag.

Discussion:
tcx.layout_raw(param_env.and(normalized))? } <del> ty::Bound(..) | ty::Placeholder(..) | ty::GeneratorWitness(..) | ty::Infer(_) => { </del> <ins> ty::Placeholder(..) | ty::GeneratorWitness(..) | ty::Infer(_) => { </ins> bug!("Layout::compute: unexpected type `{}`", ty) } <del> ty::Param(_) | ty::Error(_) => { </del> <ins> ty::Bound(..) | ty::Param(_) | ty::Error(_) => { </ins> return Err(LayoutError::Unknown(ty)); } })

}; // Early-return cases. let val_val = match val.val { <del> ty::ConstKind::Param(_) => throw_inval!(TooGeneric), </del> <ins> ty::ConstKind::Param(_) | ty::ConstKind::Bound(..) => throw_inval!(TooGeneric), </ins> ty::ConstKind::Error(_) => throw_inval!(TypeckError(ErrorReported)), ty::ConstKind::Unevaluated(def, substs, promoted) => { let instance = self.resolve(def.did, substs)?;

// happening. return Ok(self.const_eval(GlobalId { instance, promoted }, val.ty)?); } <del> ty::ConstKind::Infer(..) | ty::ConstKind::Bound(..) | ty::ConstKind::Placeholder(..) => { </del> <ins> ty::ConstKind::Infer(..) | ty::ConstKind::Placeholder(..) => { </ins> span_bug!(self.cur_span(), "const_to_op: Unexpected ConstKind {:?}", val) } ty::ConstKind::Value(val_val) => val_val,

<ins> // compile-flags: -Zsave-analysis #![feature(const_generics)] #![allow(incomplete_features)] struct Arr<const N: usize> where Assert::<{N < usize::max_value() / 2}>: IsTrue, //~ ERROR constant expression { } enum Assert<const CHECK: bool> {} trait IsTrue {} impl IsTrue for Assert<true> {} fn main() { let x: Arr<{usize::max_value()}> = Arr {}; //~^ ERROR mismatched types //~| ERROR mismatched types } </ins>

<ins> error: constant expression depends on a generic parameter --> $DIR/issue-73260.rs:6:47 | LL | where Assert::<{N < usize::max_value() / 2}>: IsTrue, |                                               ^^^^^^ | = note: this may fail depending on what value the parameter takes error[E0308]: mismatched types --> $DIR/issue-73260.rs:17:12 | LL |     let x: Arr<{usize::max_value()}> = Arr {}; |            ^^^^^^^^^^^^^^^^^^^^^^^^^ expected `false`, found `true` | = note: expected type `false` found type `true` error[E0308]: mismatched types --> $DIR/issue-73260.rs:17:40 | LL |     let x: Arr<{usize::max_value()}> = Arr {}; |                                        ^^^ expected `false`, found `true` | = note: expected type `false` found type `true` error: aborting due to 3 previous errors For more information about this error, try `rustc --explain E0308`. </ins>

<ins> #![feature(const_generics)] #![allow(incomplete_features)] trait If<const COND: bool> {} impl If<true> for () {} trait IsZero<const N: u8> { type Answer; } struct True; struct False; impl<const N: u8> IsZero<N> for () where (): If<{N == 0}> { //~ERROR constant expression type Answer = True; } trait Foobar<const N: u8> {} impl<const N: u8> Foobar<N> for () where (): IsZero<N, Answer = True> {} impl<const N: u8> Foobar<N> for () where (): IsZero<N, Answer = False> {} fn main() {} </ins>

<ins> error: constant expression depends on a generic parameter --> $DIR/issue-74634.rs:15:11 | LL | where (): If<{N == 0}> { |           ^^^^^^^^^^^^ | = note: this may fail depending on what value the parameter takes error: aborting due to previous error </ins>

<ins> #![feature(const_generics, const_evaluatable_checked)] #![allow(incomplete_features)] struct Bool<const B: bool>; trait True {} impl True for Bool<true> {} fn test<T, const P: usize>() where Bool<{core::mem::size_of::<T>() > 4}>: True { todo!() } fn main() { test::<2>(); //~^ ERROR wrong number of type //~| ERROR constant expression depends } </ins>

<ins> error[E0107]: wrong number of type arguments: expected 1, found 0 --> $DIR/issue-76595.rs:15:5 | LL |     test::<2>(); |     ^^^^^^^^^ expected 1 type argument error: constant expression depends on a generic parameter --> $DIR/issue-76595.rs:15:5 | LL | fn test<T, const P: usize>() where Bool<{core::mem::size_of::<T>() > 4}>: True { |                                                                           ---- required by this bound in `test` ... LL |     test::<2>(); |     ^^^^^^^^^ | = note: this may fail depending on what value the parameter takes error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0107`. </ins>