File: set_fail_prefix.doc

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\DOC set_fail_prefix

\TYPE {set_fail_prefix : (string -> (* -> **) -> * -> **)}

\SYNOPSIS
Specifies a prefix to the failure string for a function evaluation.

\DESCRIBE
When applied to a string {s} and a function {f}, the function {set_fail_prefix}
gives a function which behaves identically to {f} except that on failure, the
failure string given by {f} has {s} and {`--`} prepended.

\FAILURE
Never fails.

\EXAMPLE
{
#BETA_CONV "1 + 1";;
evaluation failed     BETA_CONV

#(set_fail_prefix `Application to "1 + 1" ` BETA_CONV) "1 + 1";;
evaluation failed     Application to "1 + 1"  -- BETA_CONV
}
\USES
Providing a traceback of failures through function applications.

\SEEALSO
set_fail.

\ENDDOC