diff options
| author |  Adam Chlipala <adam@chlipala.net> | 2010-10-10 14:41:03 -0400 |
|---|---|---|
| committer | Adam Chlipala <adam@chlipala.net> | 2010-10-10 14:41:03 -0400 |
| commit | 948aa854af8ca5560a1eea5221c4a1f3a6901970 (patch) | |
| tree | 2e1c023171139b80bf24b4ec2b5a85115973e945 /src/elab_err.sml | |
| parent | bfeac162a328dba937a28e747e4fc4006fac500c (diff) | |
Hopeful fix for the Great Unification Bug
Diffstat (limited to 'src/elab_err.sml')
| -rw-r--r-- | src/elab_err.sml | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/src/elab_err.sml b/src/elab_err.sml index 80de9497..f8a16294 100644 --- a/src/elab_err.sml +++ b/src/elab_err.sml @@ -1,4 +1,4 @@ -(* Copyright (c) 2008, Adam Chlipala +(* Copyright (c) 2008-2010, Adam Chlipala * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -112,7 +112,6 @@ fun conError env err = eprefaces' [("Constructor", p_con env c), ("Kind", p_kind env k)]) - datatype cunify_error = CKind of kind * kind * kunify_error | COccursCheckFailed of con * con @@ -120,6 +119,8 @@ datatype cunify_error = | CExplicitness of con * con | CKindof of kind * con * string | CRecordFailure of con * con * (con * con * con) option + | TooLifty of ErrorMsg.span * ErrorMsg.span + | TooUnify of con * con fun cunifyError env err = case err of @@ -154,6 +155,13 @@ fun cunifyError env err = [("Field", p_con env nm), ("Value 1", p_con env t1), ("Value 2", p_con env t2)])) + | TooLifty (loc1, loc2) => + (ErrorMsg.errorAt loc1 "Can't unify two unification variables that both have suspended liftings"; + eprefaces' [("Other location", Print.PD.string (ErrorMsg.spanToString loc2))]) + | TooUnify (c1, c2) => + (ErrorMsg.errorAt (#2 c1) "Substitution in constructor is blocked by a too-deep unification variable"; + eprefaces' [("Replacement", p_con env c1), + ("Body", p_con env c2)]) datatype exp_error = UnboundExp of ErrorMsg.span * string |