id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	os	architecture	failure	difficulty	testcase	blockedby	blocking	related
1721	Make GHCi print the entire result of an interactive 'bind' statement	simonpj		"Suppose
{{{
  foo :: Int -> IO (Maybe Int, Bool)
}}}
Then here's a GHCi interaction:
{{{
Prelude> foo 3
(Just 3,True)           -- Entire result printed
Prelude> (Just x, _) <- foo 3
3                       -- Value of x printed
Prelude> (Just x, y) <- foo 3
                        -- Nothing at all printed
Prelude> (_, _) <- foo 3
                        -- Nothing at all printed
Prelude> 
}}}
GHCi prints the result of a bind, `p <- e`, if and only if the pattern `p` binds exactly one variable.  This is a bit odd; you get no info if it binds more than one.

A different and simpler behaviour would be to print the entire result every time.  That is, all the commands above would print `(Just 3, True)`.

I'm recording this ticket so that we remember the suggestion.  I don't know for sure if it's a good one.  Add comments if you have an opinion"	feature request	new	lowest	7.6.2	Compiler	6.6.1				Unknown/Multiple	Unknown/Multiple	None/Unknown	Unknown