rust/src/test/run-pass/macro-by-example-2.rs

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fn main() {
#macro([#zip_or_unzip[[x, ...], [y, ...]], [[x, y], ...]],
[#zip_or_unzip[[xx, yy], ...], [[xx, ...], [yy, ...]]]);
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assert (#zip_or_unzip[[1, 2, 3, 4], [5, 6, 7, 8]] ==
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[[1, 5], [2, 6], [3, 7], [4, 8]]);
assert (#zip_or_unzip[[1, 5], [2, 6], [3, 7], [4, 8]] ==
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[[1, 2, 3, 4], [5, 6, 7, 8]]);
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#macro([#nested[[[x, ...], ...], [[y, ...], ...]],
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[[[x, y], ...], ...]]);
assert (#nested[[[1, 2, 3, 4, 5], [7, 8, 9, 10, 11, 12]],
[[-1, -2, -3, -4, -5], [-7, -8, -9, -10, -11, -12]]] ==
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[[[1, -1], [2, -2], [3, -3], [4, -4], [5, -5]],
[[7, -7], [8, -8], [9, -9], [10, -10], [11, -11],
[12, -12]]]);
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#macro([#dup[y, [x, ...]], [[y, x], ...]]);
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assert (#dup[1, [1, 2, 3, 4]] == [[1, 1], [1, 2], [1, 3], [1, 4]]);
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#macro([#lambda[x, #<t>, body, #<s>],
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{
fn result(x: t) -> s { ret body }
result
}]);
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assert ((#lambda[i, #<uint>, i + 4u, #<uint>])(12u) == 16u);
#macro[[#sum[x, xs, ...], x + #sum[xs, ...]],
[#sum[], 0]];
assert (#sum[1,2,3,4] == 10);
#macro[[#transcr_mixed[a, as, ...], #sum[6, as, ...] * a]];
assert (#transcr_mixed[10, 5, 4, 3, 2, 1] == 210);
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#macro[[#surround[pre, [xs, ...], post],
[pre, xs, ..., post]]];
assert (#surround[1, [2,3,4], 5] == [1,2,3,4,5]);
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}