Alan Zimmerman authored Aug 27, 2023 and Ben Gamari committed Sep 18, 2023

The code (from T23465.hs)

    {-# WARNInG in "x-c" e "d" #-}
    e = e

gives an incorrect span for the LWarnDecl GhcPs

Closes #23892

It also fixes the Test23465/Test23464 mixup

(cherry picked from commit ede3df27)