"non-ident macro paths are experimental" when building

[geluso]

Ever seen these errors? I don't know enough about Rust to know how to fix them.

error[E0658]: non-ident macro paths are experimental (see issue #35896)
  --> world/src/biome.rs:95:17
   |
95 |                 die!("Failed to join map");
   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error[E0658]: non-ident macro paths are experimental (see issue #35896)
   --> world/src/map.rs:147:21
    |
147 |                     die!("Unknown map glyph '{}'", c);
    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error[E0658]: non-ident macro paths are experimental (see issue #35896)
   --> world/src/map.rs:331:13
    |
331 |             die!("No room left");
    |             ^^^^^^^^^^^^^^^^^^^^^
    |
    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error: aborting due to 3 previous errors

[rsaarelm]

I'm currently developing the master branch with the nightly rustc compiler and looks like it's broken with the stable compiler. Get the nightly compiler to build it, the game's not ready for public consumption yet so there's no point tracking the stable compiler yet.