Compile error: use of unstable library feature 'unicode_internals'

[leenozara]

error[E0658]: use of unstable library feature 'unicode_internals'
   --> src/fmt_macros.rs:422:34
    |
422 |             Some(&(pos, c)) if c.is_xid_start() => {
    |                                  ^^^^^^^^^^^^
    |
    = help: add `#![feature(unicode_internals)]` to the crate attributes to enable

error[E0658]: use of unstable library feature 'unicode_internals'
   --> src/fmt_macros.rs:431:18
    |
431 |             if c.is_xid_continue() {
    |                  ^^^^^^^^^^^^^^^
    |
    = help: add `#![feature(unicode_internals)]` to the crate attributes to enable

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0658`.
error: Could not compile `runtime-fmt`.

I'll provide a PR shortly.

[trinity-1686a]

When will the crate version be bumped so that the fix is available on crates.io?

[SpaceManiac]

@fdb-hiroshima It's done.

[igalic]

interestingly, just a month later, not only does this not work any more:

error[E0599]: no method named `is_xid_start` found for type `char` in the current scope
   --> /home/meena/.cargo/registry/src/github.com-1ecc6299db9ec823/runtime-fmt-0.4.0/src/fmt_macros.rs:422:34
    |
422 |             Some(&(pos, c)) if c.is_xid_start() => {
    |                                  ^^^^^^^^^^^^ method not found in `char`

error[E0599]: no method named `is_xid_continue` found for type `char` in the current scope
   --> /home/meena/.cargo/registry/src/github.com-1ecc6299db9ec823/runtime-fmt-0.4.0/src/fmt_macros.rs:431:18
    |
431 |             if c.is_xid_continue() {
    |                  ^^^^^^^^^^^^^^^ method not found in `char`

error: aborting due to 2 previous errors

[trinity-1686a]

what rustc version?

[igalic]

@fdb-hiroshima see #10.