Unable to build without `std` feature

[paulyoung]

error[E0433]: failed to resolve: use of undeclared crate or module `std`
 --> /Users/py/.cargo/registry/src/index.crates.io-6f17d22bba15001f/ezlua-0.4.4/src/ffi/lua54/lauxlib.rs:3:5
  |
3 | use std::os::raw::{c_char, c_int, c_void};
  |     ^^^ use of undeclared crate or module `std`

error[E0433]: failed to resolve: use of undeclared crate or module `std`
 --> /Users/py/.cargo/registry/src/index.crates.io-6f17d22bba15001f/ezlua-0.4.4/src/ffi/lua54/lua.rs:3:5
  |
3 | use std::marker::{PhantomData, PhantomPinned};
  |     ^^^ use of undeclared crate or module `std`

error[E0432]: unresolved import `std`
 --> /Users/py/.cargo/registry/src/index.crates.io-6f17d22bba15001f/ezlua-0.4.4/src/ffi/lua54/lauxlib.rs:4:5
  |
4 | use std::ptr;
  |     ^^^ use of undeclared crate or module `std`

error[E0433]: failed to resolve: use of undeclared crate or module `std`
 --> /Users/py/.cargo/registry/src/index.crates.io-6f17d22bba15001f/ezlua-0.4.4/src/ffi/lua54/lua.rs:5:5
  |
5 | use std::os::raw::{c_char, c_double, c_int, c_uchar, c_ushort, c_void};
  |     ^^^ use of undeclared crate or module `std`

error[E0432]: unresolved import `std`
 --> /Users/py/.cargo/registry/src/index.crates.io-6f17d22bba15001f/ezlua-0.4.4/src/ffi/lua54/lua.rs:4:5
  |
4 | use std::mem;
  |     ^^^ use of undeclared crate or module `std`

error[E0433]: failed to resolve: use of undeclared crate or module `std`
   --> /Users/py/.cargo/registry/src/index.crates.io-6f17d22bba15001f/ezlua-0.4.4/src/ffi/lua54/lua.rs:430:9
    |
430 |     use std::ffi::CString;
    |         ^^^ use of undeclared crate or module `std`

error[E0433]: failed to resolve: use of undeclared crate or module `std`
 --> /Users/py/.cargo/registry/src/index.crates.io-6f17d22bba15001f/ezlua-0.4.4/src/ffi/lua54/lualib.rs:3:5
  |
3 | use std::os::raw::c_int;
  |     ^^^ use of undeclared crate or module `std`

error[E0432]: unresolved import `std`
 --> /Users/py/.cargo/registry/src/index.crates.io-6f17d22bba15001f/ezlua-0.4.4/src/ffi/lua54/lua.rs:6:5
  |
6 | use std::ptr;
  |     ^^^ use of undeclared crate or module `std`

error[E0282]: type annotations needed
    --> /Users/py/.cargo/registry/src/index.crates.io-6f17d22bba15001f/ezlua-0.4.4/src/luaapi.rs:1144:25
     |
1144 |                 name: s.as_ptr(),
     |                         ^^^^^^ cannot infer type

error[E0271]: type mismatch resolving `<lua_State as Pointee>::Metadata == ()`
   --> /Users/py/.cargo/registry/src/index.crates.io-6f17d22bba15001f/ezlua-0.4.4/src/coroutine.rs:95:21
    |
95  |             .resume(null_mut(), self.push_multi(args)? as _, &mut self.nres)
    |                     ^^^^^^^^ expected `()`, found associated type
    |
    = note:    expected unit type `()`
            found associated type `<lua54::lua::lua_State as Pointee>::Metadata`
    = help: consider constraining the associated type `<lua54::lua::lua_State as Pointee>::Metadata` to `()`
    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
    = note: required for `lua54::lua::lua_State` to implement `Thin`
note: required by a bound in `null_mut`
   --> /nix/store/yhcb1r9s0xq8hqpjgpcbm93zrrf5jqf0-rust-default-1.74.0-nightly-2023-09-23/lib/rustlib/src/rust/library/core/src/ptr/mod.rs:543:35
    |
543 | pub const fn null_mut<T: ?Sized + Thin>() -> *mut T {
    |                                   ^^^^ required by this bound in `null_mut`

error[E0271]: type mismatch resolving `<lua_State as Pointee>::Metadata == ()`
   --> /Users/py/.cargo/registry/src/index.crates.io-6f17d22bba15001f/ezlua-0.4.4/src/state.rs:462:50
    |
462 |                 co.map(|s| s.as_ptr()).unwrap_or(core::ptr::null_mut()),
    |                                                  ^^^^^^^^^^^^^^^^^^^ expected `()`, found associated type
    |
    = note:    expected unit type `()`
            found associated type `<lua54::lua::lua_State as Pointee>::Metadata`
    = help: consider constraining the associated type `<lua54::lua::lua_State as Pointee>::Metadata` to `()`
    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
    = note: required for `lua54::lua::lua_State` to implement `Thin`
note: required by a bound in `null_mut`
   --> /nix/store/yhcb1r9s0xq8hqpjgpcbm93zrrf5jqf0-rust-default-1.74.0-nightly-2023-09-23/lib/rustlib/src/rust/library/core/src/ptr/mod.rs:543:35
    |
543 | pub const fn null_mut<T: ?Sized + Thin>() -> *mut T {
    |                                   ^^^^ required by this bound in `null_mut`

Some errors have detailed explanations: E0271, E0282, E0432, E0433.
For more information about an error, try `rustc --explain E0271`.
error: could not compile `ezlua` (lib) due to 11 previous errors
Error: cargo failed with error ExitStatus(unix_wait_status(25856))

[metaworm]

Try the latest commit of the main branch.

[paulyoung]

Thanks! I’ll give it a try later today. Looks like it was simpler than the error messages implied.