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sx/examples/types/0141-types-slice-literal-direct-call-arg.sx
agra 66bdc70bf1 test: group examples into per-category folders
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// A `.[...]` array/slice literal passed DIRECTLY as a call argument behaves
// identically to binding it to a typed local first: the literal is
// materialized into addressable storage and a {ptr,len} slice header is built
// over it, so the callee reads the element CONTENTS correctly.
// Regression (issue 0084): a direct literal arg passed the raw array value
// where a slice was expected, so the callee read its header off the wrong
// bytes and returned garbage (0).
#import "modules/std.sx";
count_nope :: (xs: []string) -> i64 {
n := 0;
i := 0;
while i < xs.len { if xs[i] == "nope" { n += 1; } i += 1; }
return n;
}
sum :: (xs: []i64) -> i64 {
s := 0;
i := 0;
while i < xs.len { s += xs[i]; i += 1; }
return s;
}
main :: () {
// string slice: direct literal vs local-bound — both see 2 "nope"s.
print("str direct={}\n", count_nope(.["a", "nope", "b", "nope"]));
local : []string = .["a", "nope", "b", "nope"];
print("str local={}\n", count_nope(local));
// numeric slice: direct literal vs local-bound — both sum to 100.
print("num direct={}\n", sum(.[10, 20, 30, 40]));
nums : []i64 = .[10, 20, 30, 40];
print("num local={}\n", sum(nums));
}