Unused code deletion based on the output not being affected

cleanup_generate.sh

#!/bin/bash
set -x -e

check() {
    mkdir -p /tmp/a /tmp/b
    cp generate.cr /tmp/a/
    sed -i -e "${1}d" generate.cr
    cp generate.cr /tmp/b/
    (cd /tmp/b && crystal build --warnings=none generate.cr) || return 4
    (cd /tmp/a && crystal build --warnings=none generate.cr) || return 5

    for sfml in ~/downloads/SFML-*/include; do
        a="/tmp/a/$sfml/gen"
        b="/tmp/b/$sfml/gen"
        rm -r "$a" "$b"
        mkdir -p "$a" "$b"
        (cd "$b" && timeout 2 /tmp/b/generate "$sfml" &>out.txt) || return 2
        (cd "$a" && timeout 2 /tmp/a/generate "$sfml" &>out.txt) || return 3
        diff -r "$a" "$b" || return 1
    done
}

for l in $(seq $(wc -l <generate.cr) -1 1); do
    if check "$l"; then
        git add generate.cr
    else
        git checkout -- generate.cr
    fi
done