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+Builtin functions
+=================
+
+In following examples, lines starting with ``>`` represent characters
+provided to input stream. Lines without starting ``>`` character represent
+evaluation results written to output stream.
+
+Available builtin functions:
+
+    * `eval`
+
+    * `apply`
+
+    * `error`
+
+    * `cons`
+
+    * `set-car!`
+
+    * `set-cdr!`
+
+    * `number?`
+
+    * `pair?`
+
+    * `string?`
+
+    * `symbol?`
+
+    * `function?`
+
+    * `syntax?`
+
+    * `eq?`
+
+    * `equal?`
+
+    * `>`
+
+    * `<`
+
+    * `+`
+
+    * `-`
+
+    * `*`
+
+    * `/`
+
+    * `read`
+
+    * `read-u8`
+
+    * `peek-u8`
+
+    * `write`
+
+    * `write-u8`
+
+    * `make-string`
+
+    * `string-length`
+
+    * `string-ref`
+
+    * `string-set!`
+
+
+Source code
+-----------
+
+function.h
+''''''''''
+
+.. literalinclude:: ../src_c/function.h
+    :language: c
+
+
+function.c
+''''''''''
+
+.. literalinclude:: ../src_c/function.c
+    :language: c