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// 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() {
}
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