69 lines
1.5 KiB
Rust
69 lines
1.5 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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fn match_ref(v: Option<int>) -> int {
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match v {
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Some(ref i) => {
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*i
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}
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None => {0}
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}
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}
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fn match_ref_unused(v: Option<int>) {
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match v {
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Some(_) => {}
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None => {}
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}
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}
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fn match_const_reg(v: &const Option<int>) -> int {
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match *v {
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Some(ref i) => {*i} //~ ERROR cannot borrow
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//~^ ERROR unsafe borrow
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None => {0}
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}
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}
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fn impure(_i: int) {
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}
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fn match_const_reg_unused(v: &const Option<int>) {
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match *v {
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Some(_) => {impure(0)} // OK because nothing is captured
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None => {}
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}
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}
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fn match_const_reg_impure(v: &const Option<int>) {
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match *v {
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Some(ref i) => {impure(*i)} //~ ERROR cannot borrow
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//~^ ERROR unsafe borrow
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None => {}
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}
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}
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fn match_imm_reg(v: &Option<int>) {
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match *v {
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Some(ref i) => {impure(*i)} // OK because immutable
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None => {}
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}
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}
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fn match_mut_reg(v: &mut Option<int>) {
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match *v {
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Some(ref i) => {impure(*i)} // OK, frozen
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None => {}
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}
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}
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fn main() {
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}
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