check-pretty fails with RUSTFLAGS="-Z time-passes" #14607

        task '[pretty] run-pass/variant-structs-trivial.rs' failed at 'explicit failure', /home/keegan/proj/rust/rust2/src/compiletest/runtest.rs:1305

---- [pretty] run-pass/vec-concat.rs stdout ----

        error: pretty-printing failed in round 1
        status: exit code: 101
        command: x86_64-unknown-linux-gnu/stage1/bin/rustc - --pretty normal --target=x86_64-unknown-linux-gnu -L x86_64-unknown-linux-gnu/test/run-pass/vec-concat.stage1-x86_64-unknown-linux-gnu.libaux -Z time-passes --cfg debug -O -L x86_64-unknown-linux-gnu/rt
        stdout:
        ------------------------------------------

        ------------------------------------------
        stderr:
        ------------------------------------------
        <anon>:1:1: 1:5 error: expected item but found `time`
        <anon>:1 time: 0.002 s  parsing
                 ^~~~

        ------------------------------------------