Plan for iter 24.3, the second + final half of milestone 24.
Task 1: append fn print to prelude.ail.json with explicit-let body
\\x -> let s = show x in do io/print_str s. Task 2: mono symbol
IR-shape pin (AST-level Term-pattern match on post-mono
print__Int.body — protects the load-bearing let-binder for the
heap-Str RC discipline per eob.1 Str carve-out). Tasks 3-5:
three E2E fixtures + tests (positive 4-prim smoke, user-ADT
data IntBox + instance prelude.Show IntBox, negative print f
where f : Int -> Int firing NoInstance). Task 5 also extends
the Float-aware NoInstance arm at lib.rs:770-779 with a parallel
Show-aware branch. Task 6: DESIGN.md amendments (§Prelude classes
flip print to shipped, §Float semantics gains Show-Float NaN
paragraph). Task 7: roadmap P1 Show+print flips to [x] + new
P2 entry for io/print_int|bool|float retirement (insert at top of P2).
Task 8: integration + bench.
Boss decisions in plan Pre-flight section: ship explicit-let
(no auto-desugarer); AST-level IR-shape pin (Term pattern match);
NoInstance Show diagnostic wording with literal DESIGN.md section
cross-reference; P2 top-insertion for the retirement entry;
let-bound concrete fn-type for the negative fixture.
Brummel
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