two tests for binding locals to functions which is not yet implemented
test for using a variable across two function boundaries
an intermediate function can hold any fixed count of bound variables
a function-level frame knows the corresponding function_generator
instructions for binding and retrieving values in functions
a local_frame always knows its function_generator
method stub for retrieving any local variable by name
remove obsolete method and implement its replacement
separate method for name resolving
simplify helper method
function_generator knows its parent
a local_frame knows the innermost frame of the outer function
moved knowledge of the outer frame from the local_frame to function_generator
move class loop to separate files
emit bind instructions
fix bind emission
test invalid lvalues
current_function instruction
emit code for capturing and forwarding bound values
implement forwarding of bound values