error[E0015]: cannot call non-const fn `Vec::::len` in constant functions --> $DIR/issue-94675.rs:9:27 | LL | self.bar[0] = baz.len(); | ^^^^^ | = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants error[E0277]: the trait bound `Vec: ~const IndexMut` is not satisfied --> $DIR/issue-94675.rs:9:9 | LL | self.bar[0] = baz.len(); | ^^^^^^^^^^^ vector indices are of type `usize` or ranges of `usize` | = help: the trait `~const IndexMut` is not implemented for `Vec` note: the trait `IndexMut` is implemented for `Vec`, but that implementation is not `const` --> $DIR/issue-94675.rs:9:9 | LL | self.bar[0] = baz.len(); | ^^^^^^^^^^^ error[E0015]: cannot call non-const operator in constant functions --> $DIR/issue-94675.rs:9:9 | LL | self.bar[0] = baz.len(); | ^^^^^^^^^^^ | note: impl defined here, but it is not `const` --> $SRC_DIR/alloc/src/vec/mod.rs:LL:COL = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants error: aborting due to 3 previous errors Some errors have detailed explanations: E0015, E0277. For more information about an error, try `rustc --explain E0015`.