Fat Pointer Hardening: All 17 Journeys to 10/10

5 sections

100%
Section 1 Iterator–Collection Ownership Contract Section 2 Monomorphization of Captured Types Section 3 Aggregate Value Emission Section 4 Combinatorial Test Matrix Section 5 Verification
Overview

Fix 3 CRITICAL bugs and 1 HIGH codegen issue discovered by the fat pointer code journeys (J14-J17), then harden the compiler with a combinatorial test matrix that crosses fat pointer types with every language feature. The goal: all 17 code journeys score 10.0/10, and the test matrix prevents future regressions at any intersection of fat pointers with other features.

✓

Completed

5 sections
Section 1 Complete

Iterator–Collection Ownership Contract

Fix the ownership contract between iterators and collections so that [T] where T has Drop never double-frees elements

58/58 tasks
Section 2 Complete

Monomorphization of Captured Types

Closures capturing any non-scalar type (str, [T], structs, closures) compile correctly in AOT with fully resolved types

46/46 tasks
Section 3 Complete

Aggregate Value Emission

Fat pointer values (str, [T], closures) are copied with aggregate load/store instead of field-by-field GEP+load+insertvalue, eliminating 3-6x instruction bloat

34/34 tasks
Section 4 Complete

Combinatorial Test Matrix

Every cell of {type categories} x {language features} is covered by an AOT test, ensuring no intersection of fat pointers with any feature is untested

50/50 tasks
Section 5 Complete

Verification

All 17 code journeys score 10.0/10, test-all.sh green, Valgrind clean

39/39 tasks