The correct is to compare the MRB_STACK_GROWTH.
add post mandatory argument test
should care about the case that given arguments are less then mandatory formal arguments and optional arguments exist; close #2144
make peek_n append p->pb to list
Accept =begin and =end with spaces after

Conflicts:

	src/parse.y
Add tests for multiline comment parsing

Conflicts:

	test/t/syntax.rb
use Kernel#__send__ insteard of Kernel#send

Conflicts:

	mrbgems/mruby-symbol-ext/mrblib/symbol.rb