expr main <((during ages) ![NUM, :]), (during)>
let message "Use `for ages` instead of `during ages` when referring to a vague stretch of time."
let description "The idiomatic duration is 'for ages', so swap the initial preposition whenever the words refer to a general span."
let kind "Usage"
let becomes "for"
let strategy "MatchCase"
# True positives
# Replace `during ages` with `for ages` when the phrase describes a vague stretch of time.
test "Stories accumulate during ages past." "Stories accumulate for ages past."
test "During ages of exile, they remained resolute." "For ages of exile, they remained resolute."
test "She waited during ages for the letter." "She waited for ages for the letter."
test "We have been friends during ages long." "We have been friends for ages long."
test "During ages gone by, the valley slept." "For ages gone by, the valley slept."
test "People argued during ages on behalf of the plan." "People argued for ages on behalf of the plan."
test "During ages past, kings ruled here." "For ages past, kings ruled here."
test "I reminisced during ages about the river." "I reminisced for ages about the river."
test "During ages of waiting he kept faith." "For ages of waiting he kept faith."
test "Why do you speak during ages like that?" "Why do you speak for ages like that?"
test "During ages after the fall they rebuilt." "For ages after the fall they rebuilt."
test "She sang during ages when storms howled." "She sang for ages when storms howled."
# Guardrails
# Numeric age ranges should remain untouched.
# Keep the precise age range framing.
allows "During ages: 35 to 40, we recorded the decline."