Merge `.. .` tokens producing invalid syntax

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:

1. no changes
2. 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

1. rustfmt ./file-with-foo-fn-from-summary.rs

Meta

rustfmt --version:

rustfmt 1.10.0-nightly (11177f2235 2026-08-02)