diff options
Diffstat (limited to 'src/elab_err.sml')
-rw-r--r-- | src/elab_err.sml | 15 |
1 files changed, 4 insertions, 11 deletions
diff --git a/src/elab_err.sml b/src/elab_err.sml index f21ddce0..0e04cf51 100644 --- a/src/elab_err.sml +++ b/src/elab_err.sml @@ -239,17 +239,10 @@ fun expError env err = ("Type", p_con env c)]) co) | Unresolvable (loc, c) => (ErrorMsg.errorAt loc "Can't resolve type class instance"; - eprefaces' [("Class constraint", p_con env c)(*, - ("Class database", p_list (fn (c, rules) => - box [P.p_con env c, - PD.string ":", - space, - p_list (fn (c, e) => - box [p_exp env e, - PD.string ":", - space, - P.p_con env c]) rules]) - (E.listClasses env))*)]) + eprefaces' ([("Class constraint", p_con env c)] + @ (case E.resolveFailureCause () of + NONE => [] + | SOME c' => [("Reduced to unresolvable", p_con env c')]))) | IllegalRec (x, e) => (ErrorMsg.errorAt (#2 e) "Illegal 'val rec' righthand side (must be a function abstraction)"; eprefaces' [("Variable", PD.string x), |