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sx/examples/protocols/0408-protocols-optional-protocol.sx
agra 66bdc70bf1 test: group examples into per-category folders
Move examples/*.sx and their expected/ snapshots into per-category
subfolders (examples/<category>/...). Folder = leading filename token,
with ffi-objc/ffi-jni kept whole; filenames are unchanged. The corpus
runner and LSP sweep now discover each category's expected/ dir, while
issues/ stays flat. Example 1058's repo-root-relative companion import
is made file-relative. Path strings embedded in 164 snapshots were
regenerated (path-only changes). Test-layout docs in CLAUDE.md updated.
2026-06-21 14:41:34 +03:00

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// `?Protocol = null` — optional protocol boxes use sentinel-shape
// (ctx == null is the "none" state), so they cost no extra storage
// beyond the protocol's standard 2-pointer layout. Method calls on
// a non-null optional protocol auto-unwrap and dispatch through the
// vtable / inline fn-ptrs as usual.
#import "modules/std.sx";
GPU :: protocol {
ping :: (self: *Self) -> i64;
}
Impl :: struct {}
impl GPU for Impl {
ping :: (self: *Impl) -> i64 { 42 }
}
main :: () -> i32 {
g : ?GPU = null;
if g != null {
print("BAD: g not null at start\n");
} else {
print("g initially null\n");
}
g = xx @Impl.{};
if g != null {
n := g.ping();
print("after assign: g.ping() = {}\n", n);
} else {
print("BAD: g still null after assign\n");
}
0
}