Answer the MethodContext to which the receiver refers, or
nil if it has been optimized away
isBlock
Answer whether the receiver is a block context
block
isDisabled
Answers false, because contexts that are skipped when doing a return
are always MethodContexts. BlockContexts are removed from the chain
whenever a non-local return is done, while MethodContexts need to
stay there in case there is a non-local return from the #ensure:
block.
isEnvironment
To create a valid execution environment for the interpreter even before
it starts, GST creates a fake context whose selector is nil and which
can be used as a marker for the current execution environment. Answer
whether the receiver is that kind of context (always false, since
those contexts are always MethodContexts).
isUnwind
Answers whether the context must continue execution even after a
non-local return (a return from the enclosing method of a block, or
a call to the #continue: method of ContextPart). Such contexts are
created only by #ensure: and are always MethodContexts.
nthOuterContext: n
Answer the n-th outer block/method context for the receiver
outerContext
Answer the outer block/method context for the receiver