`ParseResult#continuable?` expected to be true codes

[tompng]

I expect these incomplete code to be continuable, which currently returns false.

code	reason
-	- 1
[1,	[1, 2]
f arg1,	f arg1, arg2
def f =	def f = body
def $a	def $a.method_name; end
a =	a = rhs
a,b	a,b = rhs
a,1	a,1.b = rhs
class	class ClassName; end
class a	class a.method_chain::ClassName; end

This is a code I originally used to find continuable syntax error pattern in IRB, modified to find continuable? #=> false code.
https://gist.github.com/tompng/e6cfa660a0552d080cc07382849a3011

[kddnewton]

Perfect, thanks @tompng — I'll get on this.