it cannot build rust 1.37 in armv7 netbsd-9 the file work/rustc-1.37.0-src/src/libcore/task/wake.rs I put the requested diretive #![feature(const_fn) in the module in several places without success error[E0723]: function pointers in const fn are unstable (see issue #57563) --> src/libcore/task/wake.rs:159:9 | 159 | clone: unsafe fn(*const ()) -> RawWaker, | ^^^^^ | = help: add #![feature(const_fn)] to the crate attributes to enable error: aborting due to previous error For more information about this error, try `rustc --explain E0723`. error: Could not compile `core`. |