types ratchet: t27b conformance fixture postfix_optional.t27 redefines Point and Reply (Refs #7437) #7522

Since #7462 (92e2e44, 2026-10-07 11:32Z), specs/tri/t27b/conformance/postfix_optional.t27 defines const Point = struct { x: i32, y: i32 } and const Reply = struct { ok, note, code, at }.

• Point is already defined in specs/tri/math/bezier.t27 with f64 fields.
• Reply is already defined in specs/compiler/zig_field_syntax.t27 with an error field.

tri types ratchet reports Reply as a NEW conflict on master. Once the port rename for #7437 lands, it reports Point too.

Conformance fixture type names must be unique in the corpus (Q66), as in #7315. Fix: give the fixture's two structs fixture-unique names. The behaviour is unchanged, so the t27b expectation row stays pass.

Boundary

• specs/compiler/zig_field_syntax.t27
• specs/tri/math/bezier.t27
• specs/tri/t27b/conformance/postfix_optional.t27

User Scenarios

• Given the conformance fixture specs/tri/t27b/conformance/postfix_optional.t27 defines const Point and const Reply that clash with existing definitions in specs/tri/math/bezier.t27 and specs/compiler/zig_field_syntax.t27, when tri types ratchet runs, then it reports Reply as a NEW conflict (and Point after types ratchet: 26 new conflicted type names on master, hidden while Corpus ratchet died at its first step #7437 lands).

Requirements

• FR-001: The fixture specs/tri/t27b/conformance/postfix_optional.t27 MUST rename its Point struct to a fixture-unique name (e.g., PostfixPoint).
• FR-002: The fixture specs/tri/t27b/conformance/postfix_optional.t27 MUST rename its Reply struct to a fixture-unique name (e.g., PostfixReply).
• FR-003: The behavioural semantics of the fixture MUST remain unchanged; the t27b expectation row MUST stay pass.

Success Criteria

• tri types ratchet runs against the corpus and exits with exit 0 (no NEW conflicts for Point or Reply from the fixture).
• The conformance test suite for t27b includes postfix_optional.t27 and reports 5 tests passed (or the existing pass count unchanged).
• The modified file specs/tri/t27b/conformance/postfix_optional.t27 contains no definition named Point or Reply.