id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc	difficulty	ghcversion	platform
951	Incorrect error messages for non-existing dependencies	guest		"When the build-depends-field contains non-existing packages, cabal-install sometimes does not report that these packages could not be found but complains about other constraints being unsolvable.

The attached cabal-file contains a dependency for a non-existing package called ""bogus"". This is what I get:

{{{
$ cabal install --only-dependencies --dry-run
Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: foo (user goal)
rejecting: foo-1.0 (global constraint requires ==0.1.0.0)
trying: foo-0.1.0.0
trying: heist-0.8.0 (dependency of foo-0.1.0.0)
trying: transformers-0.3.0.0 (dependency of heist-0.8.0)
next goal: mtl (dependency of heist-0.8.0)
rejecting: mtl-2.1.1, 2.1 (conflict: heist => mtl>=2.0 && <2.1)
rejecting: mtl-2.0.1.0, 2.0.0.0 (conflict: transformers==0.3.0.0, mtl =>
transformers==0.2.*)
rejecting: mtl-1.1.1.1, 1.1.1.0, 1.1.0.2, 1.1.0.1, 1.1.0.0, 1.0 (conflict:
heist => mtl>=2.0 && <2.1)
}}}
When removing ""bogus"" from the build-depends, cabal-install is able to come up with a working install plan.

Used versions:
{{{
$ cabal --version
cabal-install version 0.14.0
using version 1.14.0 of the Cabal library
}}}"	enhancement	new	normal	cabal-install-0.16	cabal-install tool	1.14.0	normal		message, solver	soenkehahn@…	unknown	7.4.1	Linux