Comment 6 for bug 709292

commit 171fde84561e232b8af8c05b82dfe8a8f9e08340
Author: Attila Lendvai <email address hidden>
Date: Fri Jan 28 16:09:47 2011 +0100

    add SB-EXT:*SUPPRESS-PRINT-ERRORS* modelled after *BREAK-ON-SIGNALS*

      When non-NIL, OUTPUT-OBJECT (our main entry to the printer) binds a handler
      that handles conditions of the specified type by printing an error marker
      instead of signaling an error.

      WRITE also accepts :SUPPRESS-ERRORS, and WITH-STANDARD-IO-SYNTAX binds it to
      NIL.

      Calls SIGNAL before handling the condition so outer handlers get a chance to
      use restarts, etc.