import {-# SOURCE #-} Match ( matchSinglePat )
import HsSyn
+import HsUtils
import CoreSyn
import Var
import Type
import DsMonad
import DsUtils
-import DsBreakpoint
import Unique
import PrelInfo
import TysWiredIn
import PrelNames
import Name
import SrcLoc
+
\end{code}
@dsGuarded@ is used for both @case@ expressions and pattern bindings.
-> GRHSs Id -- Guarded RHSs
-> Type -- Type of RHS
-> DsM MatchResult
-
-dsGRHSs hs_ctx pats (GRHSs grhss binds) rhs_ty
- = mappM (dsGRHS hs_ctx pats rhs_ty) grhss `thenDs` \ match_results ->
+dsGRHSs hs_ctx pats (GRHSs grhss binds) rhs_ty =
+ bindLocalsDs (bindsBinders ++ patsBinders) $
+ mappM (dsGRHS hs_ctx pats rhs_ty) grhss `thenDs` \ match_results ->
let
match_result1 = foldr1 combineMatchResults match_results
- match_result2 = adjustMatchResultDs (dsLocalBinds binds) match_result1
+ match_result2 = adjustMatchResultDs
+ (\e -> bindLocalsDs patsBinders $ dsLocalBinds binds e)
+ match_result1
-- NB: nested dsLet inside matchResult
in
returnDs match_result2
+ where bindsBinders = map unLoc (collectLocalBinders binds)
+ patsBinders = collectPatsBinders (map (L undefined) pats)
dsGRHS hs_ctx pats rhs_ty (L loc (GRHS guards rhs))
= matchGuards (map unLoc guards) hs_ctx rhs rhs_ty
returnDs (mkGuardedMatchResult pred_expr match_result)
matchGuards (LetStmt binds : stmts) ctx rhs rhs_ty
- = matchGuards stmts ctx rhs rhs_ty `thenDs` \ match_result ->
+ = bindLocalsDs (map unLoc $ collectLocalBinders binds) $
+ matchGuards stmts ctx rhs rhs_ty `thenDs` \ match_result ->
returnDs (adjustMatchResultDs (dsLocalBinds binds) match_result)
-- NB the dsLet occurs inside the match_result
-- Reason: dsLet takes the body expression as its argument
-- body expression in hand
matchGuards (BindStmt pat bind_rhs _ _ : stmts) ctx rhs rhs_ty
- = matchGuards stmts ctx rhs rhs_ty `thenDs` \ match_result ->
+ = bindLocalsDs (collectPatBinders pat) $
+ matchGuards stmts ctx rhs rhs_ty `thenDs` \ match_result ->
dsLExpr bind_rhs `thenDs` \ core_rhs ->
matchSinglePat core_rhs ctx pat rhs_ty match_result
\end{code}