48 lines
1.1 KiB
Rust
48 lines
1.1 KiB
Rust
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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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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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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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