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-rw-r--r--pretyping/typeclasses.ml3
1 files changed, 2 insertions, 1 deletions
diff --git a/pretyping/typeclasses.ml b/pretyping/typeclasses.ml
index f153b6341..3f947fd23 100644
--- a/pretyping/typeclasses.ml
+++ b/pretyping/typeclasses.ml
@@ -219,7 +219,8 @@ let discharge_class (_,cl) =
in grs', discharge_rel_context subst 1 ctx @ ctx' in
let cl_impl' = Lib.discharge_global cl.cl_impl in
if cl_impl' == cl.cl_impl then cl else
- let ctx, _, _ as info = abs_context cl in
+ let info = abs_context cl in
+ let ctx = info.Lib.abstr_ctx in
let ctx, subst = rel_of_variable_context ctx in
let usubst, cl_univs' = Lib.discharge_abstract_universe_context info cl.cl_univs in
let context = discharge_context ctx (subst, usubst) cl.cl_context in