d8076b9333
Surface rename of the signed integer family: s1..s64 become i1..i64
(u1..u64, usize, isize unchanged). 'string' keeps the s-prefix arm in
name classification; width parsing moves to the i-prefix arm next to
isize.
Internal TypeId tags follow the surface (.s8/.s16/.s32/.s64 ->
.i8/.i16/.i32/.i64), as do mono-key mangle fragments (ptr_i64,
tu_i64_bool) and all display/diagnostic formatting (i{d}).
Migrated in the same sweep: stdlib + examples + issue repros + FFI C
companions (shared symbol names like ffi_id_i64), expected
stdout/stderr/ir snapshots, specs.md, readme.md, CLAUDE.md/AGENTS.md,
implementation_plan.md, docs/, issue writeups. Vendored stb_image and
historical flow state left untouched.
zig build test: 426/426; examples suite: 595/595.
1.7 KiB
0116 — writes through module consts are not rejected (struct-const write bus-errors at runtime)
RESOLVED (2026-06-11, PLAN-CONST-AGG step 2). The assignment lowering rejects any target chain ROOTED at a constant — a const-flagged global (array consts, #run consts) or a module value const (struct consts incl.) — with
cannot assign through constant 'X'. A deref along the chain (p.*) breaks the root (pointer writes are permanently unchecked — the documented pointer contract, specs.md §Pointer Types); a local shadowing the const name stays writable. Regression test: examples/1162-diagnostics-const-write-rejected.sx (struct field — the crash repro, array element, compound, bare scalar).
Symptom. Assigning through a module-level constant compiles silently. For a struct-literal const the store lands in read-only memory and the program crashes at runtime.
- Observed: compiles;
Bus errorat runtime on the store. - Expected: compile-time diagnostic —
cannot assign through constant 'WHITE'.
Reproduction
#import "modules/std.sx";
Color :: struct { r, g, b: i64; }
WHITE :: Color.{ r = 255, g = 255, b = 255 };
main :: () {
WHITE.r = 0; // compiles; bus error at runtime
print("{}\n", WHITE.r);
}
(Copies are fine and stay fine: w := WHITE; w.r = 0; mutates the copy.)
Fix
Scheduled as step 2 of current/PLAN-CONST-AGG.md (aggregate consts):
one rejection rule for assignment/compound-assignment targets whose ROOT
identifier resolves to a module const (module_const_map author) or a
const-flagged global (the array consts that plan introduces). Diagnose at
the assignment site; pin the repro above as a diagnostics example.