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author | msozeau <msozeau@85f007b7-540e-0410-9357-904b9bb8a0f7> | 2008-03-28 20:22:43 +0000 |
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committer | msozeau <msozeau@85f007b7-540e-0410-9357-904b9bb8a0f7> | 2008-03-28 20:22:43 +0000 |
commit | 6bd55e5c17463d3868becba4064dba46c95c4028 (patch) | |
tree | d9883d5846ada3e5f0d049d711da7a1414f410ad /pretyping/pattern.ml | |
parent | 5bb2935198434eceea41e1b966b56a175def396d (diff) |
- 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
Diffstat (limited to 'pretyping/pattern.ml')
-rw-r--r-- | pretyping/pattern.ml | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/pretyping/pattern.ml b/pretyping/pattern.ml index 845f9fae1..90a3728eb 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 -> |