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Assign collection element ty to loop local tvar when checking loops 

This makes the type declarationg for the loop variable optional in
most cases.

Closes #790
This commit is contained in:
Marijn Haverbeke 2011-08-02 15:09:27 +02:00
parent 78a0d380cc
commit 2d5b651f49
1 changed files with 5 additions and 2 deletions
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7
src/comp/middle/typeck.rs
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@ -1605,8 +1605,11 @@ fn check_expr(fcx: &@fn_ctxt, expr: &@ast::expr) -> bool {
// A generic function for checking for or for-each loops
fn check_for_or_for_each(fcx: &@fn_ctxt, local: &@ast::local,
element_ty: &ty::t, body: &ast::blk,
node_id: ast::node_id) -> bool {
element_ty: ty::t, body: &ast::blk,
node_id: ast::node_id) -> bool {
let locid = lookup_local(fcx, local.span, local.node.id);
element_ty = demand::simple(fcx, local.span, element_ty,
ty::mk_var(fcx.ccx.tcx, locid));
let bot = check_decl_local(fcx, local);
check_block(fcx, body);
// Unify type of decl with element type of the seq