id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	os	architecture	failure	difficulty	testcase	blockedby	blocking	related
5243	ghc --make and ghci misses dependencies with explicit braces	simonpj	simonmar	"Karl Crary tripped over this deeply strange case:
{{{
Bar.hs
   module Bar where
   bar = True

Main.hs
   { import Bar; main = print bar }
}}}
Notice that `Main.hs` is missing its ""`module Main where`"" part, but has explicit braces and semicolons.  The BNF in the language standard says that is fine.

If you compile them one at a time all is well:
{{{
ghc -c Bar.hs
ghc -c Main.hs 
}}}
But if you use `--make` it breaks:
{{{
simonpj@cam-04-unx:~/tmp$ ghc --make Main -ddump-parsed -ddump-rn
[1 of 1] Compiling Main             ( Main.hs, Main.o )

==================== Parser ====================
import Bar
main = print foo

Main.hs:1:29: Not in scope: `foo'
}}}
Bizarre, eh?  This is ghc 7.0.3.  It's as if `--make` somehow ignores the import of `Bar`, even though it is parsed just fine.

Simon"	bug	closed	high	7.2.1	Compiler	7.0.3	fixed		crary@…	Unknown/Multiple	Unknown/Multiple	GHC rejects valid program		parser/should_compile/T5243