error[E0080]: evaluation of constant value failed --> $SRC_DIR/core/src/mem/mod.rs:LL:COL | = note: values of the type `[u8; usize::MAX]` are too big for the current architecture | note: inside `std::mem::size_of::<[u8; usize::MAX]>` --> $SRC_DIR/core/src/mem/mod.rs:LL:COL note: inside `main` --> $DIR/issue-55878.rs:7:26 | LL | println!("Size: {}", std::mem::size_of::<[u8; u64::MAX as usize]>()); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ note: erroneous constant encountered --> $DIR/issue-55878.rs:7:26 | LL | println!("Size: {}", std::mem::size_of::<[u8; u64::MAX as usize]>()); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: this note originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info) note: erroneous constant encountered --> $DIR/issue-55878.rs:7:26 | LL | println!("Size: {}", std::mem::size_of::<[u8; u64::MAX as usize]>()); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: this note originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info) error: aborting due to previous error For more information about this error, try `rustc --explain E0080`.