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Alex Biehl authored
In a project with lots of constraints it's not always obvious from which file a constraint is coming from. Also we are currently showing a big `TODO` message in place of the file name which is not nice. Prior to this patch ``` $ cabal build all Resolving dependencies... cabal: Could not resolve dependencies: [__0] trying: some-package-0.24.1.2 (user goal) [__1] trying: foldl-1.4.8 (dependency of some-package) [__2] next goal: mwc-random (dependency of foldl) [__2] rejecting: mwc-random-0.15.0.0 (constraint from project config TODO requires ==0.14.0.0) [__2] trying: mwc-random-0.14.0.0 [__3] next goal: math-functions (dependency of mwc-random) [__3] rejecting: math-functions-0.3.4.0, math-functions-0.3.3.0, math-functions-0.3.2.1, math-functions-0.3.2.0, math-functions-0.3.1.0, math-functions-0.3.0.2, math-functions-0.3.0.1, math-functions-0.3.0.0, math-functions-0.2.1.0, math-functions-0.2.0.2, math-functions-0.2.0.1, math-functions-0.2.0.0, math-functions-0.1.7.0, math-functions-0.1.6.0, math-functions-0.1.5.2, math-functions-0.1.5.1, math-functions-0.1.4.0, math-functions-0.1.3.0, math-functions-0.1.1.2, math-functions-0.1.1.1, math-functions-0.1.1.0, math-functions-0.1.0.0 (constraint from project config TODO requires ==0.3.4.1) [__3] fail (backjumping, conflict set: math-functions, mwc-random) After searching the rest of the dependency tree exhaustively, these were the goals I've had most trouble fulfilling: mwc-random, math-functions, foldl, some-package Try running with --minimize-conflict-set to improve the error message. ``` Note the TODO. No idea where th constraint is coming from :( With this patch applied: ``` Resolving dependencies... cabal: Could not resolve dependencies: [__0] trying: some-package-0.24.1.2 (user goal) [__1] trying: foldl-1.4.8 (dependency of some-packagge) [__2] next goal: mwc-random (dependency of foldl) [__2] rejecting: mwc-random-0.15.0.0 (constraint from project config /Users/a602232/git/haskell-libs/cabal.project.freeze requires ==0.14.0.0) [__2] trying: mwc-random-0.14.0.0 [__3] next goal: math-functions (dependency of mwc-random) [__3] rejecting: math-functions-0.3.4.0, math-functions-0.3.3.0, math-functions-0.3.2.1, math-functions-0.3.2.0, math-functions-0.3.1.0, math-functions-0.3.0.2, math-functions-0.3.0.1, math-functions-0.3.0.0, math-functions-0.2.1.0, math-functions-0.2.0.2, math-functions-0.2.0.1, math-functions-0.2.0.0, math-functions-0.1.7.0, math-functions-0.1.6.0, math-functions-0.1.5.2, math-functions-0.1.5.1, math-functions-0.1.4.0, math-functions-0.1.3.0, math-functions-0.1.1.2, math-functions-0.1.1.1, math-functions-0.1.1.0, math-functions-0.1.0.0 (constraint from project config /Users/a602232/git/haskell-libs/cabal.project.freeze requires ==0.3.4.1) [__3] fail (backjumping, conflict set: math-functions, mwc-random) After searching the rest of the dependency tree exhaustively, these were the goals I've had most trouble fulfilling: mwc-random, math-functions, foldl, some-package Try running with --minimize-conflict-set to improve the error message. ``` Note that we now explicitly say where the constraint is coming from!
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