cfg_match macro name conflict on the latest nightly

[Imberflur]

Trying to compile this with the latest nightly, I got these errors:

error[E0658]: use of unstable library feature 'cfg_match'
  --> /home/imbris/.cargo/registry/src/index.crates.io-6f17d22bba15001f/maybe-dangling-0.1.0/src/maybe_dangling.rs:65:1
   |
65 | crate::cfg_match! {
   | ^^^^^^^^^^^^^^^^
   |
   = note: see issue #115585 <https://github.com/rust-lang/rust/issues/115585> for more information
   = help: add `#![feature(cfg_match)]` to the crate attributes to enable

error: no rules expected the token `feature`
  --> /home/imbris/.cargo/registry/src/index.crates.io-6f17d22bba15001f/maybe-dangling-0.1.0/src/maybe_dangling.rs:66:5
   |
66 |     feature = "nightly-dropck_eyepatch" => {
   |     ^^^^^^^ no rules expected this token in macro call
   |
note: while trying to match `cfg`
  --> /rustc/6cf088810f66fff15d05bf7135c5f5888b7c93b4/library/core/src/macros/mod.rs:204:11

error[E0659]: `cfg_match` is ambiguous
  --> /home/imbris/.cargo/registry/src/index.crates.io-6f17d22bba15001f/maybe-dangling-0.1.0/src/lib.rs:42:5
   |
42 | use cfg_match;
   |     ^^^^^^^^^ ambiguous name
   |
   = note: ambiguous because of a conflict between a macro-expanded name and a less macro-expanded name from outer scope during import or macro resolution
   = note: `cfg_match` could refer to a macro from prelude
note: `cfg_match` could also refer to the macro defined here
  --> /home/imbris/.cargo/registry/src/index.crates.io-6f17d22bba15001f/maybe-dangling-0.1.0/src/lib.rs:17:1
   |
17 | / macro_rules! cfg_match {
18 | |     (
19 | |         _ => { $($expansion:tt)* } $(,)?
20 | |     ) => (
...  |
40 | |     });
41 | | }
   | |_^

error[E0658]: use of unstable library feature 'cfg_match'
  --> /home/imbris/.cargo/registry/src/index.crates.io-6f17d22bba15001f/maybe-dangling-0.1.0/src/lib.rs:42:5
   |
42 | use cfg_match;
   |     ^^^^^^^^^
   |
   = note: see issue #115585 <https://github.com/rust-lang/rust/issues/115585> for more information
   = help: add `#![feature(cfg_match)]` to the crate attributes to enable

The fix made here looks promising: getditto/safer_ffi#191