breakByModule session mod args@(arg1:rest)
| all isDigit arg1 = do -- looks like a line number
breakByModuleLine mod (read arg1) rest
- | otherwise = io $ putStrLn "Invalid arguments to :break"
+breakByModule session mod _
+ = breakSyntax
breakByModuleLine :: Module -> Int -> [String] -> GHCi ()
breakByModuleLine mod line args
| [] <- args = findBreakAndSet mod $ findBreakByLine line
| [col] <- args, all isDigit col =
findBreakAndSet mod $ findBreakByCoord Nothing (line, read col)
- | otherwise = io $ putStrLn "Invalid arguments to :break"
+ | otherwise = breakSyntax
+
+breakSyntax = throwDyn (CmdLineError "Syntax: :break [<mod>] <line> [<column>]")
findBreakAndSet :: Module -> (TickArray -> Maybe (Int, SrcSpan)) -> GHCi ()
findBreakAndSet mod lookupTickTree = do