Files
sx/examples/0709-modules-issue-0056-diamond-param-impl.sx
agra 33a6f5c650 wip(E4): partial source-pin + non-transitive flip [stdlib E4 attempt-1 WIP checkpoint]
Incomplete WIP from a worker killed at the 55-min wall (large blast radius:
core source-pin + ~8 example migrations + ~10 library module migrations).
Committed so the resumed session continues on a clean tree. May not build.
2026-06-08 11:12:08 +03:00

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// Regression (issue 0056): a parameterised-protocol (`Into`) impl living in a
// module reached through more than one import path must register exactly once.
//
// main ─┬─ issue-0056/mid_a ─┐
// └─ issue-0056/mid_b ─┴─ issue-0056/common (holds `impl Into(Wrapped) for s64`)
//
// Impl blocks are anonymous (no `declName`), so before the fix the diamond
// dedup in imports.zig appended the cached node once per path and the second
// registration tripped: `duplicate impl 'Into' for source 's64'`. Now the flat
// decl list also dedups by node identity, so this builds and prints 7.
#import "modules/std.sx";
// `Wrapped` lives in the shared `common.sx`; bare-import visibility is
// non-transitive, so naming it here means importing it here (not via mid_a/b).
#import "0709-modules-issue-0056/common.sx";
#import "0709-modules-issue-0056/mid_a.sx";
#import "0709-modules-issue-0056/mid_b.sx";
main :: () -> s32 {
w : Wrapped = xx 7;
print("{}\n", w.v);
0
}