From 6bd55e5c17463d3868becba4064dba46c95c4028 Mon Sep 17 00:00:00 2001
From: msozeau
Date: Fri, 28 Mar 2008 20:22:43 +0000
Subject: - Second pass on implementation of let pattern. Parse "let ' par [as
 x]?   [in I] := t [return pred] in b", just as SSReflect does with let:.  
 Change implementation: no longer a separate AST node, just add a case_style  
 annotation on Cases to indicate it (if ML was dependently typed we   could
 ensure that LetPatternStyle Cases have only one term to be   matched and one
 branch, alas...). This factors out most code and we lose   no functionality
 (win ! win !). Add LetPat.v test suite.

- Slight improvement of inference of return clauses for dependent
  pattern matching. If matching a variable of non-dependent type
  under a tycon that mentions it while giving no return clause, the
  dependency will be automatically infered. Examples at the end of
  DepPat. Should get rid of most explicit returns under tycons.


git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@10727 85f007b7-540e-0410-9357-904b9bb8a0f7
---
 pretyping/pattern.ml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'pretyping/pattern.ml')

diff --git a/pretyping/pattern.ml b/pretyping/pattern.ml
index 845f9fae1f..90a3728ebb 100644
--- a/pretyping/pattern.ml
+++ b/pretyping/pattern.ml
@@ -245,7 +245,7 @@ let rec pat_of_raw metas vars = function
       let c = List.fold_left mkRLambda c nal in
       PCase ((LetStyle,[|1|],None,None),PMeta None,pat_of_raw metas vars b,
              [|pat_of_raw metas vars c|])
-  | RCases (loc,p,[c,(na,indnames)],brs) ->
+  | RCases (loc,sty,p,[c,(na,indnames)],brs) ->
       let pred,ind_nargs, ind = match p,indnames with
 	| Some p, Some (_,ind,n,nal) ->
 	    rev_it_mkPLambda nal (mkPLambda na (pat_of_raw metas vars p)),
@@ -259,7 +259,7 @@ let rec pat_of_raw metas vars = function
 	Array.init (List.length brs) (pat_of_raw_branch loc metas vars ind brs)
       in
       let cstr_nargs,brs = (Array.map fst cbrs, Array.map snd cbrs) in
-      PCase ((RegularStyle,cstr_nargs,ind,ind_nargs), pred,
+      PCase ((sty,cstr_nargs,ind,ind_nargs), pred,
              pat_of_raw metas vars c, brs)
              
   | r ->
-- 
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