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Disallow implicit arg copying when the function returns a ref

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Issue #918
This commit is contained in:
Marijn Haverbeke 2011-09-14 14:56:51 +02:00
parent 93d2a4f82a
commit 7d69712dee
1 changed files with 2 additions and 1 deletions
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3
src/comp/middle/alias.rs
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@ -176,6 +176,7 @@ fn cant_copy(cx: ctx, b: binding) -> bool {
fn check_call(cx: ctx, f: @ast::expr, args: [@ast::expr]) -> [binding] {
let fty = ty::type_autoderef(cx.tcx, ty::expr_ty(cx.tcx, f));
let ret_ref = ty::ty_fn_ret_style(cx.tcx, fty) == ast::return_ref;
let arg_ts = ty::ty_fn_args(cx.tcx, fty);
let mut_roots: [{arg: uint, node: node_id}] = [];
let bindings = [];
@ -197,7 +198,7 @@ fn check_call(cx: ctx, f: @ast::expr, args: [@ast::expr]) -> [binding] {
inner_mut(root.ds));
new_bnd.copied = alt arg_t.mode {
ast::by_move. { copied }
ast::by_ref. { not_copied }
ast::by_ref. { ret_ref ? not_allowed : not_copied }
ast::by_mut_ref. { not_allowed }
};
bindings += [new_bnd];