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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
<HTML
><HEAD
><TITLE
>Conditions
[CLHS-9]</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
"><LINK
REV="MADE"
HREF="mailto:clisp-list@sf.net"><LINK
REL="HOME"
TITLE="Implementation Notes for GNU CLISP."
HREF="impnotes-top.html"><LINK
REL="UP"
TITLE="Chapters or the Common Lisp HyperSpec"
HREF="clhs-chapters.html"><LINK
REL="PREVIOUS"
TITLE="Structures
[CLHS-8]"
HREF="structures.html"><LINK
REL="NEXT"
TITLE="The Conditions Dictionary
[CLHS-9.2]"
HREF="cond-dict.html"><LINK
REL="STYLESHEET"
TYPE="text/css"
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><BODY
CLASS="chapter"
BGCOLOR="#FFFFFF"
TEXT="#000000"
LINK="#0000FF"
VLINK="#840084"
ALINK="#0000FF"
><DIV
CLASS="NAVHEADER"
><TABLE
SUMMARY="Header navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TH
COLSPAN="3"
ALIGN="center"
>Implementation Notes for <A
HREF="http://www.gnu.org"
TARGET="_top"
>GNU</A
> <A
HREF="http://clisp.cons.org"
TARGET="_top"
><B
CLASS="command"
>CLISP</B
></A
>.: These notes document <A
HREF="http://clisp.cons.org"
TARGET="_top"
><B
CLASS="command"
>CLISP</B
></A
> version 2.31.</TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="bottom"
><A
HREF="structures.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
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>Next</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><DIV
CLASS="chapter"
><H1
><A
NAME="conditions"
></A
>Chapter 9. Conditions
<A
HREF="http://www.lisp.org/HyperSpec/Body/chap-9.html"
TARGET="_top"
>[CLHS-9]</A
></H1
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
>9.1. <A
HREF="conditions.html#cond-nl"
>Embedded Newlines in Condition Reports
<A
HREF="http://www.lisp.org/HyperSpec/Body/sec_9-1-3-1-3.html"
TARGET="_top"
>[CLHS-9.1.3.1.3]</A
></A
></DT
><DT
>9.2. <A
HREF="cond-dict.html"
>The Conditions Dictionary
<A
HREF="http://www.lisp.org/HyperSpec/Body/sec_the_condi_s_dictionary.html"
TARGET="_top"
>[CLHS-9.2]</A
></A
></DT
></DL
></DIV
><P
ALIGN="justify"
>When an error occurred, you are in a break loop. You can evaluate
forms as usual. The <B
CLASS="command"
>help</B
> command (or help key if
there is one) lists the available <A
HREF="environment.html#debugger"
>debugging
commands</A
>.</P
><DIV
CLASS="formalpara"
><P
><A
NAME="muffle-cerrors"
></A
><B
>Macro <A
HREF="conditions.html#muffle-cerrors"
><TT
CLASS="function"
>EXT:MUFFLE-CERRORS</TT
></A
>. </B
>The macro <TT
CLASS="sexp"
>(<A
HREF="conditions.html#muffle-cerrors"
><TT
CLASS="function"
>EXT:MUFFLE-CERRORS</TT
></A
> {<TT
CLASS="replaceable"
><I
>form</I
></TT
>}*)</TT
>
executes the <TT
CLASS="replaceable"
><I
>form</I
></TT
>s. When a continuable error occurs, no message is
printed, instead, the <A
HREF="http://www.lisp.org/HyperSpec/Body/fun_abortcm_c_cm_use-value.html"
TARGET="_top"
><TT
CLASS="function"
>CONTINUE</TT
></A
> <A
HREF="http://www.lisp.org/HyperSpec/Body/syscla_restart.html"
TARGET="_top"
><TT
CLASS="classname"
>RESTART</TT
></A
> is invoked.</P
></DIV
><DIV
CLASS="formalpara"
><P
><A
NAME="appease-cerrors"
></A
><B
>Macro <A
HREF="conditions.html#appease-cerrors"
><TT
CLASS="function"
>EXT:APPEASE-CERRORS</TT
></A
>. </B
>The macro <TT
CLASS="sexp"
>(<A
HREF="conditions.html#appease-cerrors"
><TT
CLASS="function"
>EXT:APPEASE-CERRORS</TT
></A
> {<TT
CLASS="replaceable"
><I
>form</I
></TT
>}*)</TT
>
executes the <TT
CLASS="replaceable"
><I
>form</I
></TT
>s. Continuable errors are reported as warnings
and the <A
HREF="http://www.lisp.org/HyperSpec/Body/fun_abortcm_c_cm_use-value.html"
TARGET="_top"
><TT
CLASS="function"
>CONTINUE</TT
></A
> <A
HREF="http://www.lisp.org/HyperSpec/Body/syscla_restart.html"
TARGET="_top"
><TT
CLASS="classname"
>RESTART</TT
></A
> is invoked.</P
></DIV
><DIV
CLASS="formalpara"
><P
><A
NAME="exit-on-error"
></A
><B
>Macro <A
HREF="conditions.html#exit-on-error"
><TT
CLASS="function"
>EXT:EXIT-ON-ERROR</TT
></A
>. </B
>The macro <TT
CLASS="sexp"
>(<A
HREF="conditions.html#exit-on-error"
><TT
CLASS="function"
>EXT:EXIT-ON-ERROR</TT
></A
> {<TT
CLASS="replaceable"
><I
>form</I
></TT
>}*)</TT
>
executes the <TT
CLASS="replaceable"
><I
>form</I
></TT
>s. When a non-continuable error or
a <B
CLASS="keycap"
>Control</B
>-<SPAN
CLASS="keysym"
>C</SPAN
> interrupt occurs, the
error message is printed and <A
HREF="http://clisp.cons.org"
TARGET="_top"
><B
CLASS="command"
>CLISP</B
></A
> terminates with an error
status.</P
></DIV
><DIV
CLASS="formalpara"
><P
><A
NAME="with-restarts"
></A
><B
>Macro <A
HREF="conditions.html#with-restarts"
><TT
CLASS="function"
>EXT:WITH-RESTARTS</TT
></A
>. </B
>The macro <A
HREF="conditions.html#with-restarts"
><TT
CLASS="function"
>EXT:WITH-RESTARTS</TT
></A
> is like <A
HREF="http://www.lisp.org/HyperSpec/Body/mac_restart-case.html"
TARGET="_top"
><TT
CLASS="function"
>RESTART-CASE</TT
></A
>, except that the
forms are specified after the restart clauses instead of before them,
and the restarts created are not implicitly associated with any <A
HREF="http://www.lisp.org/HyperSpec/Body/contyp_condition.html"
TARGET="_top"
><TT
CLASS="classname"
>CONDITION</TT
></A
>.
<TT
CLASS="sexp"
>(<A
HREF="conditions.html#with-restarts"
><TT
CLASS="function"
>EXT:WITH-RESTARTS</TT
></A
> ({<TT
CLASS="varname"
>restart-clause</TT
>}*)
{<TT
CLASS="replaceable"
><I
>form</I
></TT
>}*)</TT
> is therefore equivalent to
<TT
CLASS="sexp"
>(<A
HREF="http://www.lisp.org/HyperSpec/Body/mac_restart-case.html"
TARGET="_top"
><TT
CLASS="function"
>RESTART-CASE</TT
></A
> (<A
HREF="http://www.lisp.org/HyperSpec/Body/speope_progn.html"
TARGET="_top"
><TT
CLASS="function"
>PROGN</TT
></A
> {<TT
CLASS="replaceable"
><I
>form</I
></TT
>}*)
{<TT
CLASS="varname"
>restart-clause</TT
>}*)</TT
>.</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="cond-nl"
></A
>9.1. Embedded Newlines in Condition Reports
<A
HREF="http://www.lisp.org/HyperSpec/Body/sec_9-1-3-1-3.html"
TARGET="_top"
>[CLHS-9.1.3.1.3]</A
></H1
><P
ALIGN="justify"
>The error message prefix for the first line is "*** - ". There is
no prefix for subsequent error lines. The aesthetics of <A
HREF="http://www.lisp.org/HyperSpec/Body/contyp_condition.html"
TARGET="_top"
><TT
CLASS="classname"
>CONDITION</TT
></A
>
reports containing an object which requires newlines when pretty
printing is enabled, is undefined.</P
></DIV
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<A
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>[CLHS-8]</A
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>The Conditions Dictionary
<A
HREF="http://www.lisp.org/HyperSpec/Body/sec_the_condi_s_dictionary.html"
TARGET="_top"
>[CLHS-9.2]</A
></TD
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