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+# Commands covered:  error, catch
+#
+# This file contains a collection of tests for one or more of the Tcl
+# built-in commands.  Sourcing this file into Tcl runs the tests and
+# generates output for errors.  No output means no errors were found.
+#
+# Copyright (c) 1991-1993 The Regents of the University of California.
+# Copyright (c) 1994-1996 Sun Microsystems, Inc.
+#
+# See the file "license.terms" for information on usage and redistribution
+# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+#
+# SCCS: @(#) error.test 1.22 97/08/12 17:02:43
+
+if {[string compare test [info procs test]] == 1} then {source defs}
+
+proc foo {} {
+    global errorInfo
+    set a [catch {format [error glorp2]} b]
+    error {Human-generated}
+}
+
+proc foo2 {} {
+    global errorInfo
+    set a [catch {format [error glorp2]} b]
+    error {Human-generated} $errorInfo
+}
+
+# Catch errors occurring in commands and errors from "error" command
+
+test error-1.1 {simple errors from commands} {
+    catch {format [string compare]} b
+} 1
+
+test error-1.2 {simple errors from commands} {
+    catch {format [string compare]} b
+    set b
+} {wrong # args: should be "string compare string1 string2"}
+
+test error-1.3 {simple errors from commands} {
+    catch {format [string compare]} b
+    set errorInfo
+} {wrong # args: should be "string compare string1 string2"
+    while executing
+"string compare"}
+
+test error-1.4 {simple errors from commands} {
+    catch {error glorp} b
+} 1
+
+test error-1.5 {simple errors from commands} {
+    catch {error glorp} b
+    set b
+} glorp
+
+test error-1.6 {simple errors from commands} {
+    catch {catch a b c} b
+} 1
+
+test error-1.7 {simple errors from commands} {
+    catch {catch a b c} b
+    set b
+} {wrong # args: should be "catch command ?varName?"}
+
+test error-1.8 {simple errors from commands} {nonPortable} {
+    # This test is non-portable: it generates a memory fault on
+    # machines like DEC Alphas (infinite recursion overflows
+    # stack?)
+
+    proc p {} {
+        uplevel 1 catch p error
+    }
+    p
+} 0
+
+# Check errors nested in procedures.  Also check the optional argument
+# to "error" to generate a new error trace.
+
+test error-2.1 {errors in nested procedures} {
+    catch foo b
+} 1
+
+test error-2.2 {errors in nested procedures} {
+    catch foo b
+    set b
+} {Human-generated}
+
+test error-2.3 {errors in nested procedures} {
+    catch foo b
+    set errorInfo
+} {Human-generated
+    while executing
+"error {Human-generated}"
+    (procedure "foo" line 4)
+    invoked from within
+"foo"}
+
+test error-2.4 {errors in nested procedures} {
+    catch foo2 b
+} 1
+
+test error-2.5 {errors in nested procedures} {
+    catch foo2 b
+    set b
+} {Human-generated}
+
+test error-2.6 {errors in nested procedures} {
+    catch foo2 b
+    set errorInfo
+} {glorp2
+    while executing
+"error glorp2"
+    (procedure "foo2" line 3)
+    invoked from within
+"foo2"}
+
+# Error conditions related to "catch".
+
+test error-3.1 {errors in catch command} {
+    list [catch {catch} msg] $msg
+} {1 {wrong # args: should be "catch command ?varName?"}}
+test error-3.2 {errors in catch command} {
+    list [catch {catch a b c} msg] $msg
+} {1 {wrong # args: should be "catch command ?varName?"}}
+test error-3.3 {errors in catch command} {
+    catch {unset a}
+    set a(0) 22
+    list [catch {catch {format 44} a} msg] $msg
+} {1 {couldn't save command result in variable}}
+catch {unset a}
+
+# More tests related to errorInfo and errorCode
+
+test error-4.1 {errorInfo and errorCode variables} {
+    list [catch {error msg1 msg2 msg3} msg] $msg $errorInfo $errorCode
+} {1 msg1 msg2 msg3}
+test error-4.2 {errorInfo and errorCode variables} {
+    list [catch {error msg1 {} msg3} msg] $msg $errorInfo $errorCode
+} {1 msg1 {msg1
+    while executing
+"error msg1 {} msg3"} msg3}
+test error-4.3 {errorInfo and errorCode variables} {
+    list [catch {error msg1 {}} msg] $msg $errorInfo $errorCode
+} {1 msg1 {msg1
+    while executing
+"error msg1 {}"} NONE}
+test error-4.4 {errorInfo and errorCode variables} {
+    set errorCode bogus
+    list [catch {error msg1} msg] $msg $errorInfo $errorCode
+} {1 msg1 {msg1
+    while executing
+"error msg1"} NONE}
+test error-4.5 {errorInfo and errorCode variables} {
+    set errorCode bogus
+    list [catch {error msg1 msg2 {}} msg] $msg $errorInfo $errorCode
+} {1 msg1 msg2 {}}
+
+# Errors in error command itself
+
+test error-5.1 {errors in error command} {
+    list [catch {error} msg] $msg
+} {1 {wrong # args: should be "error message ?errorInfo? ?errorCode?"}}
+test error-5.2 {errors in error command} {
+    list [catch {error a b c d} msg] $msg
+} {1 {wrong # args: should be "error message ?errorInfo? ?errorCode?"}}
+
+# Make sure that catch resets error information
+
+test error-6.1 {catch must reset error state} {
+    catch {error outer [catch {error inner inner.errorInfo inner.errorCode}]}
+    list $errorCode $errorInfo
+} {NONE 1}
+
+catch {rename p ""}
+return ""