; Fieldtest — Floats milestone, axis 4: reach for float_to_str.
;
; Natural task: build a label like "result = <float>" by concatenating
; a Str prefix with the float's text. The LLM-author who looks at
; `ail builtins` sees `float_to_str : (Float) -> Str`, reaches for it,
; and gets a codegen-deferred error per DESIGN.md §"Float semantics":
;
;   `float_to_str` (Float → Str) is type-installed but codegen-
;   deferred to a follow-up milestone: ... Calling it typechecks but
;   produces a structured `CodegenError::Internal`.
;
; This fixture pins the reach-and-bounce. Expected: `ail check`
; succeeds; `ail build` fails with a clear, structured codegen error
; that names `float_to_str` and points at the missing runtime path.
;
; (No string-concat builtin exists either; we just print the result of
; float_to_str directly via io/print_str. The first failure point is
; codegen, before any concat would be needed.)

(module floats_4_float_to_str_reach

  (fn main
    (type (fn-type (params) (ret (con Unit)) (effects IO)))
    (params)
    (body
      (do io/print_str (app float_to_str 3.14)))))