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180 SICStus Prolog debugger command. If the value is on while printing an uncaught error exception message, the information is used to print the source code location of the culprit goal or one of its ancestors, as far as it can be determined. If the value is emacs in any of these cases, the appropriate line of code is instead highlighted, and no extra text is printed. The value is off initially, and that is its only available value in runtime systems. syntax_errors Controls what action is taken upon syntax errors in read/[1,2]. dec10 The syntax error is reported and the read is repeated. error An exception is raised. See Section 8.5 [Exception], page 172. (the default). fail The syntax error is reported and the read fails. quiet The read quietly fails. system_type A read-only flag. The value is development in development systems and runtime in runtime systems. toplevel_print_options The value is a list of options for write_term/3 (see Section 8.1.3 [Term I/O], page 142), to be used when the toplevel displays variable bindings, answer constraints. It is also used when messages are displayed. The initial value is [quoted(true),numbervars(true),portrayed(true),max_ depth(10)]. typein_module Permitted values are atoms. Controls the current type-in module (see Section 5.2 [Module Spec], page 59). Corresponds to the predicate module/1. unknown [ISO] Corresponds to the predicate unknown/2 (see Section 8.15 [Debug Pred], page 208). trace Causes calls to undefined predicates to be reported and the debugger to be entered at the earliest opportunity. (This setting is not possible in runtime systems.) fail Causes calls to such predicates to fail. warning Causes calls to such predicates to display a warning message and then fail. error Causes calls to such predicates to raise an exception (the default). See Section 8.5 [Exception], page 172.
