rust/src/test/compile-fail/pure-higher-order.rs
2012-12-10 17:32:58 -08:00

61 lines
1.6 KiB
Rust

// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
#[legacy_modes];
// Test rules governing higher-order pure fns.
pure fn range(from: uint, to: uint, f: fn(uint)) {
let mut i = from;
while i < to {
f(i); // Note: legal to call argument, even if it is not pure.
i += 1u;
}
}
pure fn range2(from: uint, to: uint, f: fn(uint)) {
do range(from, to) |i| {
f(i*2u);
}
}
pure fn range3(from: uint, to: uint, f: fn(uint)) {
range(from, to, f)
}
pure fn range4(from: uint, to: uint) {
range(from, to, print) //~ ERROR access to impure function prohibited in pure context
}
pure fn range5(from: uint, to: uint, x: {f: fn(uint)}) {
range(from, to, x.f) //~ ERROR access to impure function prohibited in pure context
}
pure fn range6(from: uint, to: uint, x: @{f: fn(uint)}) {
range(from, to, x.f) //~ ERROR access to impure function prohibited in pure context
}
pure fn range7(from: uint, to: uint) {
do range(from, to) |i| {
print(i); //~ ERROR access to impure function prohibited in pure context
}
}
pure fn range8(from: uint, to: uint) {
range(from, to, noop);
}
fn print(i: uint) { error!("i=%u", i); }
pure fn noop(_i: uint) {}
fn main() {
}