fix(SC3012)!: do not warn about \< and \> in test/[] as specified in POSIX.1-2024

CHANGELOG.md

@@ -8,6 +8,7 @@
 - SC2002 about Useless Use Of Cat is now disabled by default. It can be
   re-enabled with `--enable=useless-use-of-cat` or equivalent directive.
 - SC2015 about `A && B || C` no longer triggers when B is a test command.
+- SC3012: Do not warn about `\<` and `\>` in test/[] as specified in POSIX.1-2024
 ### Fixed
 - SC2218 about function use-before-define is now more accurate.
 - SC2317 about unreachable commands is now less spammy for nested ones.

src/ShellCheck/Checks/ShellSupport.hs

@@ -247,10 +247,10 @@ checkBashisms = ForShell [Sh, Dash, BusyboxSh] $ \t -> do
         unless isBusyboxSh $ warnMsg id 3010 "[[ ]] is"
     bashism (T_HereString id _) = warnMsg id 3011 "here-strings are"
     bashism (TC_Binary id SingleBracket op _ _)
-        | op `elem` [ "<", ">", "\\<", "\\>", "<=", ">=", "\\<=", "\\>="] =
+        | op `elem` [ "<", ">", "<=", ">=", "\\<=", "\\>="] =
             unless isDash $ warnMsg id 3012 $ "lexicographical " ++ op ++ " is"
     bashism (T_SimpleCommand id _ [asStr -> Just "test", lhs, asStr -> Just op, rhs])
-        | op `elem` [ "<", ">", "\\<", "\\>", "<=", ">=", "\\<=", "\\>="] =
+        | op `elem` [ "<", ">", "<=", ">=", "\\<=", "\\>="] =
             unless isDash $ warnMsg id 3012 $ "lexicographical " ++ op ++ " is"
     bashism (TC_Binary id SingleBracket op _ _)
         | op `elem` [ "-ot", "-nt", "-ef" ] =