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| author | U-EUROPE\dimitris <dimitris@MSRC-1361792.europe.corp.microsoft.com> | 2011-04-27 11:04:02 +0100 |
|---|---|---|
| committer | U-EUROPE\dimitris <dimitris@MSRC-1361792.europe.corp.microsoft.com> | 2011-04-27 11:04:02 +0100 |
| commit | b30f8b6540eb8fe10f06c6e12d0daa08464656c2 (patch) | |
| tree | fe4d32642e6e5eee28a872ce1a05078cf17494ea | |
| parent | 93b6e53272695a66d97bd2672dd366797176d5c5 (diff) | |
| download | haskell-b30f8b6540eb8fe10f06c6e12d0daa08464656c2.tar.gz | |
Solving one IP from another. This fixes #5120.
| -rw-r--r-- | compiler/typecheck/TcInteract.lhs | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/compiler/typecheck/TcInteract.lhs b/compiler/typecheck/TcInteract.lhs index 4a049aa3ee..fb6929ae45 100644 --- a/compiler/typecheck/TcInteract.lhs +++ b/compiler/typecheck/TcInteract.lhs @@ -1049,9 +1049,16 @@ doInteractWithInert (CIPCan { cc_id = id1, cc_flavor = ifl, cc_ip_nm = nm1, cc_i | nm1 == nm2 = -- See Note [When improvement happens] do { co_var <- newCoVar ty2 ty1 -- See Note [Efficient Orientation] - ; let flav = Wanted (combineCtLoc ifl wfl) - ; cans <- mkCanonical flav co_var - ; mkIRContinue "IP/IP fundep" workItem KeepInert cans } + ; let flav = Wanted (combineCtLoc ifl wfl) + ; cans <- mkCanonical flav co_var + ; case wfl of + Given {} -> pprPanic "Unexpected given IP" (ppr workItem) + Derived {} -> pprPanic "Unexpected derived IP" (ppr workItem) + Wanted {} -> + do { setIPBind (cc_id workItem) $ + EvCast id1 (mkSymCoercion (mkCoVarCoercion co_var)) + ; mkIRStopK "IP/IP interaction (solved)" cans } + } -- Never rewrite a given with a wanted equality, and a type function -- equality can never rewrite an equality. We rewrite LHS *and* RHS |