(Handling Errors): Index entries for error keys.

doc/ref/scheme-control.texi

@@ -894,40 +894,50 @@ in which they are used:
 
 @itemize @bullet
 @item
+@cindex @code{error-signal}
 @code{error-signal}: thrown after receiving an unhandled fatal signal
 such as SIGSEGV, SIGBUS, SIGFPE etc.  The @var{rest} argument in the throw
 contains the coded signal number (at present this is not the same as the
 usual Unix signal number).
 
 @item
+@cindex @code{system-error}
 @code{system-error}: thrown after the operating system indicates an
 error condition.  The @var{rest} argument in the throw contains the
 errno value.
 
 @item
+@cindex @code{numerical-overflow}
 @code{numerical-overflow}: numerical overflow.
 
 @item
+@cindex @code{out-of-range}
 @code{out-of-range}: the arguments to a procedure do not fall within the
 accepted domain.
 
 @item
+@cindex @code{wrong-type-arg}
 @code{wrong-type-arg}: an argument to a procedure has the wrong type.
 
 @item
+@cindex @code{wrong-number-of-args}
 @code{wrong-number-of-args}: a procedure was called with the wrong number
 of arguments.
 
 @item
+@cindex @code{memory-allocation-error}
 @code{memory-allocation-error}: memory allocation error.
 
 @item
+@cindex @code{stack-overflow}
 @code{stack-overflow}: stack overflow error.
 
 @item
+@cindex @code{regex-error}
 @code{regex-error}: errors generated by the regular expression library.
 
 @item
+@cindex @code{misc-error}
 @code{misc-error}: other errors.
 @end itemize