`c-scape` fails to compile on nightly

[LGFae]

The VaList struct has changed on Rust nightly, causing printf-compat 0.2.1 to fail to compile:

cargo c                                                                                                                        17:02:39
    Checking printf-compat v0.2.1
    Checking origin v0.26.2
error[E0107]: struct takes 1 lifetime argument but 2 lifetime arguments were supplied
   --> /home/horus/.local/share/cargo/registry/src/index.crates.io-1949cf8c6b5b557f/printf-compat-0.2.1/src/output.rs:338:14
    |
338 |     va_list: VaList<'a, 'b>,
    |              ^^^^^^   ---- help: remove the lifetime argument
    |              |
    |              expected 1 lifetime argument
    |
note: struct defined here, with 1 lifetime parameter: `'a`
   --> /home/horus/.local/share/rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ffi/va_list.rs:170:12
    |
170 | pub struct VaList<'a> {
    |            ^^^^^^ --

error[E0107]: struct takes 1 lifetime argument but 2 lifetime arguments were supplied
   --> /home/horus/.local/share/cargo/registry/src/index.crates.io-1949cf8c6b5b557f/printf-compat-0.2.1/src/output.rs:311:14
    |
311 |     va_list: VaList<'a, 'b>,
    |              ^^^^^^   ---- help: remove the lifetime argument
    |              |
    |              expected 1 lifetime argument
    |
note: struct defined here, with 1 lifetime parameter: `'a`
   --> /home/horus/.local/share/rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ffi/va_list.rs:170:12
    |
170 | pub struct VaList<'a> {
    |            ^^^^^^ --

error[E0581]: return type references lifetime `'b`, which is not constrained by the fn input types
   --> /home/horus/.local/share/cargo/registry/src/index.crates.io-1949cf8c6b5b557f/printf-compat-0.2.1/src/output.rs:312:6
    |
312 | ) -> VaListDisplay<'a, 'b> {
    |      ^^^^^^^^^^^^^^^^^^^^^

Some errors have detailed explanations: E0107, E0581.
For more information about an error, try `rustc --explain E0107`.
error: could not compile `printf-compat` (lib) due to 3 previous errors
warning: build failed, waiting for other jobs to finish...

From the printf-compat Changelog, it seems their latest release addresses this, so the fix could be as simple as bumping the printf-compat version.

[polarathene]

Would it be possible to publish a new release of the c-scape crate? Otherwise it needs to be added in a project's Cargo.toml as a patch entry (or nightly pinned to older release).

EDIT: Thanks ❤️

[polarathene]

UPDATE: Raised a PR: #173

---

Nightly changes have affected printf-compat again (0.4.0 released in April 2026, and associated upstream rust nightly-2026-04-24 change).

---

Besides bumping the dependency version, there is a slight API change of .arg() to .next_arg().

Affected files in c-scape are:

• fs/fcntl.rs
• fs/open.rs
• io/mod.rs
• mm/mod.rs
• process/exec.rs
• syscall.rs

Presumably a straight-forward resolution. Since no one has engaged about it since I'll open a PR 👍