error[E0658]: `for` is not allowed in a `const fn` --> $DIR/const-fn-error.rs:5:5 | LL | / for i in 0..x { LL | | LL | | LL | | LL | | LL | | sum += i; LL | | } | |_____^ | = note: see issue #87575 for more information = help: add `#![feature(const_for)]` to the crate attributes to enable = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date error[E0015]: cannot convert `std::ops::Range` into an iterator in constant functions --> $DIR/const-fn-error.rs:5:14 | LL | for i in 0..x { | ^^^^ | note: impl defined here, but it is not `const` --> $SRC_DIR/core/src/iter/traits/collect.rs:LL:COL = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants = help: add `#![feature(const_trait_impl)]` to the crate attributes to enable error[E0658]: mutable references are not allowed in constant functions --> $DIR/const-fn-error.rs:5:14 | LL | for i in 0..x { | ^^^^ | = note: see issue #57349 for more information = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date error[E0015]: cannot call non-const fn ` as Iterator>::next` in constant functions --> $DIR/const-fn-error.rs:5:14 | LL | for i in 0..x { | ^^^^ | = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants = help: add `#![feature(const_trait_impl)]` to the crate attributes to enable error: aborting due to 4 previous errors Some errors have detailed explanations: E0015, E0658. For more information about an error, try `rustc --explain E0015`.