knu	2018-12-24 17:11:49 +0900 (Mon, 24 Dec 2018)

  New Revision: 66525

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=66525

  Log:
    Document the "cause" keyword argument for raise

  Modified files:
    trunk/eval.c
Index: eval.c
===================================================================
--- eval.c	(revision 66524)
+++ eval.c	(revision 66525)
@@ -706,11 +706,11 @@ extract_raise_opts(int argc, const VALUE https://github.com/ruby/ruby/blob/trunk/eval.c#L706
 /*
  *  call-seq:
  *     raise
- *     raise(string)
- *     raise(exception [, string [, array]])
+ *     raise(string, cause: $!)
+ *     raise(exception [, string [, array]], cause: $!)
  *     fail
- *     fail(string)
- *     fail(exception [, string [, array]])
+ *     fail(string, cause: $!)
+ *     fail(exception [, string [, array]], cause: $!)
  *
  *  With no arguments, raises the exception in <code>$!</code> or raises
  *  a <code>RuntimeError</code> if <code>$!</code> is +nil+.
@@ -725,6 +725,11 @@ extract_raise_opts(int argc, const VALUE https://github.com/ruby/ruby/blob/trunk/eval.c#L725
  *
  *     raise "Failed to create socket"
  *     raise ArgumentError, "No parameters", caller
+ *
+ *  The +cause+ of the generated exception is automatically set to the
+ *  "current" exception (<code>$!</code>) if any.  An alternative
+ *  value, either an +Exception+ object or +nil+, can be specified via
+ *  the +:cause+ argument.
  */
 
 static VALUE

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