error[E0080]: evaluation of constant value failed --> $DIR/union-const-eval-field.rs:28:37 | LL | const FIELD3: Field3 = unsafe { UNION.field3 }; | ^^^^^^^^^^^^ using uninitialized data, but this operation requires initialized memory note: erroneous constant encountered --> $DIR/union-const-eval-field.rs:31:5 | LL | FIELD3 | ^^^^^^ note: erroneous constant encountered --> $DIR/union-const-eval-field.rs:31:5 | LL | FIELD3 | ^^^^^^ error: aborting due to previous error For more information about this error, try `rustc --explain E0080`.