case of - "of" shouldn't need to be indented in do-notation
Summary
In do-notation, it is not allowed to have the "of" on the same column as its "case". This behavior is allowed for "if"-"then" and I can't think of sample code that would break by allowing this. I suspect an inconsistency in the parsing process. :)
Steps to reproduce
main :: IO ()
main = do
putStrLn "hi"
if True then
putStrLn "hi"
else
putStrLn "hi"
if
True --useful for conditions that span multiple lines
then
putStrLn "hi"
else
putStrLn "hi"
case 1 of
1 -> putStrLn "hi"
case
1 --useful for complex case expressions that span multiple lines
of --won't work if it's not indented
1 -> putStrLn "hi"
Expected behavior
In line 18 (second-last line) it should be possible to indent the "of" one column less. For If-Then I got used to having both keywords on the same line or in the same column because this style of formatting makes scanning code a little easier.
Environment
- GHC version used: 8.10.6
Optional:
- Operating System: Windows 10 Professional
- System Architecture: x64