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Fix Trace #1494
[ghc-hetmet.git]
/
compiler
/
typecheck
/
TcInstDcls.lhs
diff --git
a/compiler/typecheck/TcInstDcls.lhs
b/compiler/typecheck/TcInstDcls.lhs
index
0dbb775
..
d314e1e
100644
(file)
--- a/
compiler/typecheck/TcInstDcls.lhs
+++ b/
compiler/typecheck/TcInstDcls.lhs
@@
-179,7
+179,10
@@
tcInstDecls1 tycl_decls inst_decls deriv_decls
-- (4) Compute instances from "deriving" clauses;
-- This stuff computes a context for the derived instance
-- decl, so it needs to know about all the instances possible
-- (4) Compute instances from "deriving" clauses;
-- This stuff computes a context for the derived instance
-- decl, so it needs to know about all the instances possible
- ; (deriv_inst_info, deriv_binds) <- tcDeriving tycl_decls deriv_decls
+ -- NB: class instance declarations can contain derivings as
+ -- part of associated data type declarations
+ ; (deriv_inst_info, deriv_binds) <- tcDeriving tycl_decls inst_decls
+ deriv_decls
; addInsts deriv_inst_info $ do {
; gbl_env <- getGblEnv
; addInsts deriv_inst_info $ do {
; gbl_env <- getGblEnv