Fixed bugs;

• Macro visibility problem has been fixed. #1
• datum->syntax hid symbols in some cases. #6
• Some port procedure caused SEGV accessing closed port. #8
• define didn't raise an error in invalid case. #9
• (tlv) miscomputed the length.
• Compiler didn't reject circular list properly.
• format caused SEGV with custom textual port.

New features;

• R7RS style SRFI library names have been supported. e.g) (srfi 1)
• SRFI-5 has been supported.
• local method form let-method has been added to (clos user).
• R6RS record has been integrated to CLOS.

Improvements;

• quasiquote now generates constant value if possible.
• Compile time procedure folding.

New platform;

• OpenBSD has been supported

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