add test cases for Array

Tiny clean-up

defines.h : Remove as already commented out.

More Contributing Documentation

Generic sh-elf target support.

Add test case for Integer#step

Don't check ObjectID of Kernel#to_s. Only class check of instance

check if an Exception instance has a "mesg" attribute

fix the issue that "Exception.new.inspect" causes SIGSEGV.

Fix include path in proc.h.

two more wrapper macros for ctype.h

we need them on the platform where 'char' is signed.

Define DBL_DIG only if it wasn't previously defined

Fixes #464.