Fix print_literal suggests wrongly for inline literal following a numbered arg

[profetia]

Closes #15576

changelog: [numbered arg] fix wrong suggestions for inline literal following a numbered arg

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r? @Alexendoo

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[samueltardieu]

Thanks. The code looks good to me. For (my) peace of mind, could you also add the following two tests to the new test function?

    println!("Hello {} is {:.p$}", "x", 0.01, p = 5);
    //~^ print_literal

    println!(
        "Hello {}: {2} is {3:.*} (which {3} with {1} places)",
        "name", 5, "x", 0.01
    );
    //~^^ print_literal

r? samueltardieu
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[rustbot]

Reminder, once the PR becomes ready for a review, use @rustbot ready.

[profetia]

Done. Thank you!

[samueltardieu]

Thanks!