comments within parameter list not idempotent

[bddap]

"not idempotent". Does does that make it aliumpotent?

Input

type T = Result<
    u32 // Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam
        // diam ac cursus. Aliquam condimentum in erat quis pretium.
        // accumsan urna. Cras volutpat sit amet quam.
        ,
    bool,
>;

Output (first run)

type T = Result<
    u32, // Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam
         // diam ac cursus. Aliquam condimentum in erat quis pretium.
         // accumsan urna. Cras volutpat sit amet quam.
    bool,
>;

Output (second run)

type T = Result<
    u32, // Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam
    // diam ac cursus. Aliquam condimentum in erat quis pretium.
    // accumsan urna. Cras volutpat sit amet quam.
    bool,
>;

[ytmimi]

Confirming I can still reproduce this with rustfmt 1.5.1-nightly (f2c31ba0 2022-07-19).

Backporting #4606 should hopefully resolve this.

[ytmimi]

When backporting #4606 we should try to add a test case for #5241