rnMatchGroup, makeMiniFixityEnv)
import HsSyn
import TcRnMonad
+import TcEnv ( thRnBrack )
import RnEnv
import RnTypes ( rnHsTypeFVs,
mkOpFormRn, mkOpAppRn, mkNegAppRn, checkSectionPrec)
import RnPat
import DynFlags ( DynFlag(..) )
import BasicTypes ( FixityDirection(..) )
-import PrelNames ( thFAKE, hasKey, assertIdKey, assertErrorName,
+import PrelNames ( hasKey, assertIdKey, assertErrorName,
loopAName, choiceAName, appAName, arrAName, composeAName, firstAName,
negateName, thenMName, bindMName, failMName, groupWithName )
mkNegAppRn e' neg_name `thenM` \ final_e ->
returnM (final_e, fv_e `plusFV` fv_neg)
-rnExpr (HsPar e)
- = rnLExpr e `thenM` \ (e', fvs_e) ->
- returnM (HsPar e', fvs_e)
-
+------------------------------------------
-- Template Haskell extensions
-- Don't ifdef-GHCI them because we want to fail gracefully
-- (not with an rnExpr crash) in a stage-1 compiler.
returnM (expr'', fvs_qq `plusFV` fvs_expr)
#endif /* GHCI */
-rnExpr section@(SectionL expr op)
- = rnLExpr expr `thenM` \ (expr', fvs_expr) ->
- rnLExpr op `thenM` \ (op', fvs_op) ->
- checkSectionPrec InfixL section op' expr' `thenM_`
- returnM (SectionL expr' op', fvs_op `plusFV` fvs_expr)
+---------------------------------------------
+-- Sections
+-- See Note [Parsing sections] in Parser.y.pp
+rnExpr (HsPar (L loc (section@(SectionL {}))))
+ = do { (section', fvs) <- rnSection section
+ ; return (HsPar (L loc section'), fvs) }
+
+rnExpr (HsPar (L loc (section@(SectionR {}))))
+ = do { (section', fvs) <- rnSection section
+ ; return (HsPar (L loc section'), fvs) }
+
+rnExpr (HsPar e)
+ = do { (e', fvs_e) <- rnLExpr e
+ ; return (HsPar e', fvs_e) }
-rnExpr section@(SectionR op expr)
- = rnLExpr op `thenM` \ (op', fvs_op) ->
- rnLExpr expr `thenM` \ (expr', fvs_expr) ->
- checkSectionPrec InfixR section op' expr' `thenM_`
- returnM (SectionR op' expr', fvs_op `plusFV` fvs_expr)
+rnExpr expr@(SectionL {})
+ = do { addErr (sectionErr expr); rnSection expr }
+rnExpr expr@(SectionR {})
+ = do { addErr (sectionErr expr); rnSection expr }
+---------------------------------------------
rnExpr (HsCoreAnn ann expr)
= rnLExpr expr `thenM` \ (expr', fvs_expr) ->
returnM (HsCoreAnn ann expr', fvs_expr)
rnExpr other = pprPanic "rnExpr: unexpected expression" (ppr other)
-- HsWrap
-\end{code}
+----------------------
+-- See Note [Parsing sections] in Parser.y.pp
+rnSection :: HsExpr RdrName -> RnM (HsExpr Name, FreeVars)
+rnSection section@(SectionR op expr)
+ = do { (op', fvs_op) <- rnLExpr op
+ ; (expr', fvs_expr) <- rnLExpr expr
+ ; checkSectionPrec InfixR section op' expr'
+ ; return (SectionR op' expr', fvs_op `plusFV` fvs_expr) }
+
+rnSection section@(SectionL expr op)
+ = do { (expr', fvs_expr) <- rnLExpr expr
+ ; (op', fvs_op) <- rnLExpr op
+ ; checkSectionPrec InfixL section op' expr'
+ ; return (SectionL expr' op', fvs_op `plusFV` fvs_expr) }
+
+rnSection other = pprPanic "rnSection" (ppr other)
+\end{code}
%************************************************************************
%* *
rnBracket (DecBr group)
= do { gbl_env <- getGblEnv
- ; let new_gbl_env = gbl_env { -- Set the module to thFAKE. The top-level names from the bracketed
- -- declarations will go into the name cache, and we don't want them to
- -- confuse the Names for the current module.
- -- By using a pretend module, thFAKE, we keep them safely out of the way.
- tcg_mod = thFAKE,
-
- -- The emptyDUs is so that we just collect uses for this group alone
- -- in the call to rnSrcDecls below
- tcg_dus = emptyDUs }
- ; setGblEnv new_gbl_env $ do {
-
- -- In this situation we want to *shadow* top-level bindings.
- -- foo = 1
- -- bar = [d| foo = 1 |]
- -- If we don't shadow, we'll get an ambiguity complaint when we do
- -- a lookupTopBndrRn (which uses lookupGreLocalRn) on the binder of the 'foo'
- --
- -- Furthermore, arguably if the splice does define foo, that should hide
- -- any foo's further out
- --
- -- The shadowing is acheived by calling rnSrcDecls with True as the shadowing flag
- ; (tcg_env, group') <- rnSrcDecls True group
+ ; let new_gbl_env = gbl_env { tcg_dus = emptyDUs }
+ -- The emptyDUs is so that we just collect uses for this
+ -- group alone in the call to rnSrcDecls below
+ ; (tcg_env, group') <- setGblEnv new_gbl_env $
+ setStage thRnBrack $
+ rnSrcDecls group
-- Discard the tcg_env; it contains only extra info about fixity
- ; return (DecBr group', allUses (tcg_dus tcg_env)) } }
+ ; return (DecBr group', allUses (tcg_dus tcg_env)) }
\end{code}
%************************************************************************
rn_rec_stmt all_bndrs (L loc (LetStmt (HsValBinds binds'))) _ = do
(binds', du_binds) <-
-- fixities and unused are handled above in rn_rec_stmts_and_then
- rnValBindsRHS all_bndrs binds'
+ rnValBindsRHS (mkNameSet all_bndrs) binds'
returnM [(duDefs du_binds, duUses du_binds,
emptyNameSet, L loc (LetStmt (HsValBinds binds')))]
msg = ptext (sLit "Illegal transform or grouping in") <+> pprStmtContext ctxt
---------
+sectionErr :: HsExpr RdrName -> SDoc
+sectionErr expr
+ = hang (ptext (sLit "A section must be enclosed in parentheses"))
+ 2 (ptext (sLit "thus:") <+> (parens (ppr expr)))
+
patSynErr :: HsExpr RdrName -> RnM (HsExpr Name, FreeVars)
patSynErr e = do { addErr (sep [ptext (sLit "Pattern syntax in expression context:"),
nest 4 (ppr e)])
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