Add CODE_SUPER_0 through CODE_SUPER_16 bytecodes to the VM for invoking inherited methods, along with a `namedCall` compiler helper that parses method names and argument lists after a dot. The interpreter dispatches super calls by walking up the class hierarchy from the receiver's immediate class, skipping methods defined on that class. Includes three test cases covering calling a different superclass method, calling the same method name, and indirectly inherited methods. Also fixes error formatting to handle newline tokens gracefully and adds a TODO note about not deduplicating placeholder constants for super calls.
Reorder the opcode enum values, dispatch table entries, switch-case handlers, and debug dump cases for CODE_LIST and CODE_CLOSURE to appear after CODE_RETURN and before CODE_CLASS, improving interpreter performance by reducing branch prediction misses for the more common instructions that now appear earlier in the switch.
Add a `defaultConstructor` function in the compiler that emits bytecode for a constructor returning the receiver, invoked during class compilation. Reorder `CODE_CLASS`, `CODE_SUBCLASS`, and method opcodes to the end of the interpret loop's jump table and switch cases, moving `CODE_CALL_0` through `CODE_CALL_16` earlier to compensate for branch alignment issues caused by removing code from `CODE_CLASS` and `CODE_CALL` handlers.
Add closure objects that wrap functions with captured upvalues, enabling
first-class closures that close over local variables from enclosing scopes.
Introduce new bytecode instructions (CODE_CLOSURE, CODE_LOAD_UPVALUE,
CODE_STORE_UPVALUE, CODE_CLOSE_UPVALUE, CODE_RETURN) and a CompilerUpvalue
tracking system with a MAX_UPVALUES limit of 256. Refactor the grammar to
strictly separate statements from expressions, fixing a bug where block
expressions incorrectly popped locals while temporaries remained on the
stack. Rename internal functions (wrenCallFunction, wrenDebugDumpInstruction,
wrenDebugDumpStack) and add Upvalue allocation, closure creation, and
debug dump support for the new instructions.
Move the dumpInstruction function and its associated opcode printing logic from wren_vm.c into a dedicated wren_debug.c source file with a corresponding wren_debug.h header. Add the new source file to the Xcode project build configuration.
