Module impls 

ASTRegApply implementations for basic mutations

These implementations enable registry-based execution for mutations defined in ryo-mutations.

Implementation Status

Mutation	V2 Status	Notes
AddField/RemoveField	Done	V1/V2 equivalent
AddDerive/RemoveDerive	Done	V1/V2 equivalent
AddVariant/RemoveVariant	Done	V1/V2 equivalent
AddMod/RemoveMod	Done	V1/V2 equivalent
AddItem/RemoveItem	Done	V2 function API
AddMethod/RemoveMethod	Done	V2 function API
CreateMod	Done	V2 function API
Rename	Done	V1/V2 equivalent
ChangeVisibility	Done	V1/V2 equivalent
AddMatchArm/RemoveMatchArm	Done	V2-only (no V1 impl)
AddStructLiteralField/…	Done	V1/V2 equivalent
OrganizeImports	Done	V2 via module_items
AssignOp	Done	Idiom: a = a + b → a += b
BoolSimplify	Done	Idiom: x == true → x
ComparisonToMethod	Done	Idiom: s == “” → s.is_empty()
CollapsibleIf	Done	Idiom: nested if → if a && b
RedundantClosure	Done	Idiom: |x| f(x) → f
FilterNext	Done	Idiom: .filter().next() → .find()
MapUnwrapOr	Done	Idiom: .map().unwrap_or() → .map_or()
CloneOnCopy	Done	Idiom: x.clone() → x (Copy types)
LoopToIterator	Done	Idiom: for loop → iterator chain
UnwrapToQuestion	Done	Idiom: .unwrap() → ?
ManualMap	Done	Idiom: match Some → .map()
MatchToIfLet	Done	Idiom: match → if let
IntroduceVariable	Done	Recursive expr replacement
MergeImplBlocks	N/A	RegistryGenerator auto-merges
ExtractTrait/InlineTrait	Done	Struct inherent impl ↔ trait
ReplaceExpr	Done	Recursive expr replacement
RemoveStatement	Done	Pattern-based stmt removal
InsertStatement	Done	Position-based stmt insertion
ReplaceStatement	Done	Stmt-to-stmt replacement
Duplicate*	Done	Via AddPureItemsMutation
AddSpec	N/A	Blueprint composition
MoveItem	N/A	Blueprint composition
PluginTransform	N/A	WASM runtime, out of scope

Quality Policy

See [super::ast_reg_apply] for the V2 implementation quality policy.

Key points:

• Each implementation must work naturally with ASTRegistry
• Do NOT create hacky workarounds to make tests pass
• If V2 cannot handle cleanly, evaluate API extensions first

Re-exports

pub use create_mod::create_mod_v2;

pub use item::add_item_v2;

pub use item::remove_item_v2;

Modules

create_mod

ASTRegApply implementation for CreateModMutation

item

ASTRegApply implementations for AddItemMutation, AddPureItemsMutation, RemoveItemMutation, and MoveItemMutation

method

ASTRegApply implementations for AddMethodMutation and RemoveMethodMutation