A-closuresC-bugI-invalid-codegood first issue
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Description
Summary
Rustfmt produces syntactically valid, but not semantically equivalent to the original code, wrapping to parens.
There is two cases actually. In second case (field) rustfmt produces invalid syntax.
I tried to format this code:
See details in rust-analyzer/23004.
fn foo() {
|| 1.. .method();
|| 1.. .field;
}
From here on, this example is used without the function signature.
Expected behavior
I expected to see this happen, two possible options:
- no changes
- range wrappend in parens:
|| (1..).method(); || (1..).field;
Actual behavior
Instead, this happened:
(|| 1..).method(); // semantically defferent: `method()` should be "method of the range"
|| 1...field; // invalid token: `...`
Reproduction Steps
rustfmt ./file-with-foo-fn-from-summary.rs
Meta
rustfmt --version:
rustfmt 1.10.0-nightly (11177f2235 2026-08-02)