//ww:error "single-dot field compound on str field"
// Lifted from test/wcc/949_dotfield_compound_run.c reject row "dotfld_he_str"
// (#34/rule-7): a compound assign on a single-dot STR field is unwired in both
// stages and MUST loud-fail. The substring is the shared diagnostic body —
// byte-identical on both stages, pinned to "str field" so it cannot also match
// the float/slice/tagged rows (no file:line, no cstage "ww: " prefix — both
// differ cs vs ww).
package main;
type S = struct { f: str, g: int };
export fn main() i32 = {
	let s: S = S{f="a", g=0};
	s.f += "x";
	return 0;
};