61 lines
1.6 KiB
Rust
61 lines
1.6 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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#[legacy_modes];
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// Test rules governing higher-order pure fns.
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pure fn range(from: uint, to: uint, f: fn(uint)) {
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let mut i = from;
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while i < to {
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f(i); // Note: legal to call argument, even if it is not pure.
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i += 1u;
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}
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}
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pure fn range2(from: uint, to: uint, f: fn(uint)) {
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do range(from, to) |i| {
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f(i*2u);
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}
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}
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pure fn range3(from: uint, to: uint, f: fn(uint)) {
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range(from, to, f)
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}
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pure fn range4(from: uint, to: uint) {
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range(from, to, print) //~ ERROR access to impure function prohibited in pure context
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}
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pure fn range5(from: uint, to: uint, x: {f: fn(uint)}) {
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range(from, to, x.f) //~ ERROR access to impure function prohibited in pure context
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}
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pure fn range6(from: uint, to: uint, x: @{f: fn(uint)}) {
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range(from, to, x.f) //~ ERROR access to impure function prohibited in pure context
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}
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pure fn range7(from: uint, to: uint) {
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do range(from, to) |i| {
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print(i); //~ ERROR access to impure function prohibited in pure context
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}
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}
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pure fn range8(from: uint, to: uint) {
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range(from, to, noop);
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}
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fn print(i: uint) { error!("i=%u", i); }
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pure fn noop(_i: uint) {}
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fn main() {
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}
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