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cargo install --git ... does not work with rustc from Homebrew (on MacOS) #5910
Description
Summary
Similar build issue to GHI #5419 but when running cargo install --git https://github.com/RustPython/RustPython rustpython
Details
Versions
$ bash --version
version 5.2.37(1)-release (x86_64-apple-darwin24.5.0)$ rustc --version
rustc 1.87.0 (17067e9ac 2025-05-09) (Homebrew)$ uname -a
Darwin Computer 24.5.0 Darwin Kernel Version 24.5.0: Tue Apr 22 19:53:26 PDT 2025; root:xnu-11417.121.6~2/RELEASE_X86_64 x86_64Reproducing the error
-
run in terminal.app on macOS (or fresh
bash -ilshell in container):cargo install --git https://github.com/RustPython/RustPython rustpython
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wait for end of proccess
-
see ERROR:
Compiling rustpython-common v0.4.0 (/Users/amak/.cargo/git/checkouts/rustpython-63090cdce5e18442/ec577e5/common)
error[E0658]: `let` expressions in this position are unstable
--> vm/src/protocol/object.rs:462:12
|
462 | if let Some(cls) = PyType::check(cls)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
error[E0658]: `let` expressions in this position are unstable
--> vm/src/protocol/object.rs:463:16
|
463 | && let Some(derived) = PyType::check(self)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
For more information about this error, try `rustc --explain E0658`.
error: could not compile `rustpython-vm` (lib) due to 2 previous errors
error: failed to compile `rustpython v0.4.0 (https://github.com/RustPython/RustPython#ec577e55)`, intermediate artifacts can be found at `<REDACTED RANDOM PATH>`.
To reuse those artifacts with a future compilation, set the environment variable `CARGO_TARGET_DIR` to that path.🤷 I was planning on using this project to learn some rust-lang, but I seem to be stuck on the rust package manager already.
I doubt the correct response is the advice from rustc --explain E0658 to "just add the corresponding feature to be able to use it" (seems hackish and contrary to the rustpython project goals, but I'm just a neophyte to rust)
I susspect the hint about this being related to rust-lang/rust#53667 is more relevant and looks to my uninitiated eyes as related to rust-lang/rust#86730 (which I'm thinking needs something like let-verify + if verified ... style fix for stable versions of rustc, but I really am just guessing)
Activity
reactive-firewall commentedon Jul 8, 2025
Additional hint:
I found the relevant code here:
RustPython/vm/src/protocol/object.rs
Lines 461 to 463 in ec577e5
youknowone commentedon Jul 8, 2025
That's by policy. Please check our README: https://github.com/RustPython/RustPython/blob/main/README.md?plain=1#L22-L26
Rust community encourage to use rustup in general.
reactive-firewall commentedon Jul 8, 2025
@youknowone, thanks for the quick response, 🙉 I miss-read the README the first time and took the example given to be the actual required version, despite the date. I should have checked for a stable upgrade 🤦 how embarrassing. 🙇 thank you again.
rustc v1.88.0 (Homebrew)