WASI: fix missing Iterator with rustc-dep-of-std

[youknowone]

#3681 (comment)

@tgross35 How can I correctly run local test of this build? I tried cargo build --target wasm32-wasip1 --features rustc-dep-of-std --no-default-features but it causes multiple patch-unrelated errors

❯ cargo build --target wasm32-wasip1 --features rustc-dep-of-std --no-default-features
error[E0432]: unresolved import `core::clone`
  --> src/lib.rs:46:11
   |
46 | use core::clone::Clone;
   |           ^^^^^ could not find `clone` in `core`

error[E0432]: unresolved import `core::ffi`
  --> src/lib.rs:48:5
   |
48 | use core::ffi;
   |     ^^^^^^^^^ no `ffi` in the root

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[tgross35]

Thanks for the quick fix! I think you can test by temporarily patching this line

libc/src/lib.rs

Line 34 in 5375260

extern crate rustc_std_workspace_core as core;

to be extern crate core as core;. If that doesn't work then I wouldn't worry about testing with that feature. Please make sure wasi still builds locally without that feature, since we don't have it in CI (we should probably add it at some point).

Edit: realizing now that this only tests that the code builds but doesn’t actually verify without the prelude. Still useful, just not 100% accurate.

[youknowone]

Thank you! I tested both with and without the feature and they look good. It doesn't complain about unused import.

[tgross35]

Great, thanks!