path: root/tests/error.test

# Commands covered:  error, catch, throw, try
#
# 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.
# Copyright (c) 1998-1999 by Scriptics Corporation.
#
# See the file "license.terms" for information on usage and redistribution of
# this file, and for a DISCLAIMER OF ALL WARRANTIES.
#
# RCS: @(#) $Id: error.test,v 1.22 2009/09/28 18:02:20 dgp Exp $

if {[lsearch [namespace children] ::tcltest] == -1} {
    package require tcltest 2
    namespace import -force ::tcltest::*
}

namespace eval ::tcl::test::error {

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 index]} b
} 1
test error-1.2 {simple errors from commands} {
    catch {format [string index]} b
    set b
} {wrong # args: should be "string index string charIndex"}
test error-1.3 {simple errors from commands} {
    catch {format [string index]} b
    set ::errorInfo
    # This used to return '... while executing ...', but string index is fully
    # compiled as of 8.4a3
} {wrong # args: should be "string index string charIndex"
    while executing
"string index"}
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 d} b
} 1
test error-1.7 {simple errors from commands} {
    catch {catch a b c d} b
    set b
} {wrong # args: should be "catch script ?resultVarName? ?optionVarName?"}
test error-1.8 {simple errors from commands} {
    # This test is non-portable: it generates a memory fault on machines like
    # DEC Alphas (infinite recursion overflows stack?)
    #
    # That claims sounds like a bug to be fixed rather than a portability
    # problem. Anyhow, I believe it's out of date (bug's been fixed) so this
    # test is re-enabled.
    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 script ?resultVarName? ?optionVarName?"}}
test error-3.2 {errors in catch command} {
    list [catch {catch a b c} msg] $msg
} {0 1}
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}
test error-6.2 {catch must reset error state} {
    catch {error outer [catch {return -level 0 -code error -errorcode BUG}]}
    list $::errorCode $::errorInfo
} {NONE 1}
test error-6.3 {catch must reset error state} {
    set ::errorCode BUG
    catch {error outer [catch set]}
    list $::errorCode $::errorInfo
} {NONE 1}
test error-6.4 {catch must reset error state} {
    catch {error [catch {error foo bar baz}] 1}
    list $::errorCode $::errorInfo
} {NONE 1}
test error-6.5 {catch must reset error state} {
    catch {error [catch {return -level 0 -code error -errorcode BUG}] 1}
    list $::errorCode $::errorInfo
} {NONE 1}
test error-6.6 {catch must reset error state} {
    catch {return -level 0 -code error -errorinfo [catch {error foo bar baz}]}
    list $::errorCode $::errorInfo
} {NONE 1}
test error-6.7 {catch must reset error state} {
    proc foo {} {
	return -code error -errorinfo [catch {error foo bar baz}]
    }
    catch foo
    list $::errorCode
} {NONE}
test error-6.8 {catch must reset error state} {
    catch {return -level 0 -code error [catch {error foo bar baz}]}
    list $::errorCode
} {NONE}
test error-6.9 {catch must reset error state} {
    proc foo {} {
	return -code error [catch {error foo bar baz}]
    }
    catch foo
    list $::errorCode
} {NONE}

test error-7.1 {Bug 1397843} -body {
    variable cmds
    proc EIWrite args {
	variable cmds
	lappend cmds [lindex [info level -2] 0]
    }
    proc BadProc {} {
	set i a
	incr i
    }
    trace add variable ::errorInfo write [namespace code EIWrite]
    catch BadProc
    trace remove variable ::errorInfo write [namespace code EIWrite]
    set cmds
} -match glob -result {*BadProc*}

# throw tests

test error-8.1 {throw produces error 1 at level 0} {
    catch { throw FOO bar }
} {1}
test error-8.2 {throw behaves as error does at level 0} {
    catch { throw FOO bar } em1 opts1
    catch { error bar {} FOO } em2 opts2
    dict set opts1 -result $em1
    dict set opts2 -result $em2
    foreach key {-code -level -result -errorcode} {
	if { [dict get $opts1 $key] ne [dict get $opts2 $key] } {
	    error "error/throw outcome differs on '$key'"
	}
    }
} {}
test error-8.3 {throw produces error 1 at level > 0} {
    proc throw_foo {} {
	throw FOO bar
    }
    catch { throw_foo }
} {1}
test error-8.4 {throw behaves as error does at level > 0} {
    proc throw_foo {} {
	throw FOO bar
    }
    proc error_foo {} {
	error bar {} FOO
    }
    catch { throw_foo } em1 opts1
    catch { error_foo } em2 opts2
    dict set opts1 -result $em1
    dict set opts2 -result $em2
    foreach key {-code -level -result -errorcode} {
	if { [dict get $opts1 $key] ne [dict get $opts2 $key] } {
	    error "error/throw outcome differs on '$key'"
	}
    }
} {}
test error-8.5 {throw syntax checks} -returnCodes error -body {
    throw
} -result {wrong # args: should be "throw type message"}
test error-8.6 {throw syntax checks} -returnCodes error -body {
    throw a
} -result {wrong # args: should be "throw type message"}
test error-8.7 {throw syntax checks} -returnCodes error -body {
    throw a b c
} -result {wrong # args: should be "throw type message"}
test error-8.8 {throw syntax checks} -returnCodes error -body {
    throw "not a \{ list" foo
} -result {unmatched open brace in list}
test error-8.9 {throw syntax checks} -returnCodes error -body {
    throw {} foo
} -result {type must be non-empty list}

# simple try tests: body completes with code ok

test error-9.1 {try (ok, empty result) with no handlers} {
    try list
} {}
test error-9.2 {try (ok, non-empty result) with no handlers} {
    try { list a b c }
} {a b c}
test error-9.3 {try (ok, non-empty result) with trap handler} {
    try { list a b c } trap {} {} { list d e f }
} {a b c}
test error-9.4 {try (ok, non-empty result) with on handler} {
    try { list a b c } on break {} { list d e f }
} {a b c}
test error-9.5 {try (ok, non-empty result) with on ok handler} {
    try { list a b c } on ok {} { list d e f }
} {d e f}

# simple try tests - "on" handler matching

test error-10.1 {try with on ok} {
    try { list a b c } on ok {} { list d e f }
} {d e f}
test error-10.2 {try with on 0} {
    try { list a b c } on 0 {} { list d e f }
} {d e f}
test error-10.3 {try with on error (using error)} {
    try { error a b c } on error {} { list d e f }
} {d e f}
test error-10.4 {try with on error (using return -code)} {
    try { return -level 0 -code 1 a } on error {} { list d e f }
} {d e f}
test error-10.5 {try with on error (using throw)} {
    try { throw c a } on error {} { list d e f }
} {d e f}
test error-10.6 {try with on 1 (using error)} {
    try { error a b c } on 1 {} { list d e f }
} {d e f}
test error-10.7 {try with on return} {
    try { return [list a b c] } on return {} { list d e f }
} {d e f}
test error-10.8 {try with on break} {
    try { break } on break {} { list d e f }
} {d e f}
test error-10.9 {try with on continue} {
    try { continue } on continue {} { list d e f }
} {d e f}
test error-10.10 {try with on for arbitrary (decimal) return code} {
    try { return -level 0 -code 123456 } on 123456 {} { list d e f }
} {d e f}
test error-10.11 {try with on for arbitrary (hex) return code} {
    try { return -level 0 -code 0x123456 } on 0x123456 {} { list d e f }
} {d e f}
test error-10.12 {try with on for arbitrary return code (mixed number representations)} {
    try { return -level 0 -code 0x10 } on 16 {} { list d e f }
} {d e f}

# simple try tests - "trap" handler matching

test error-11.1 {try with trap all} {
    try { throw FOO bar  } trap {} {} { list d e f }
} {d e f}
test error-11.2 {try with trap (exact)} {
    try { throw FOO bar  } trap {FOO} {} { list d e f }
} {d e f}
test error-11.3 {try with trap (prefix 1)} {
    try { throw [list FOO A B C D] bar  } trap {FOO} {} { list d e f }
} {d e f}
test error-11.4 {try with trap (prefix 2)} {
    try { throw [list FOO A B C D] bar  } trap {FOO A} {} { list d e f }
} {d e f}
test error-11.5 {try with trap (prefix 3)} {
    try { throw [list FOO A B C D] bar  } trap {FOO A B} {} { list d e f }
} {d e f}
test error-11.6 {try with trap (prefix 4)} {
    try { throw [list FOO A B C D] bar  } trap {FOO A B C} {} { list d e f }
} {d e f}
test error-11.7 {try with trap (exact, 5 elements)} {
    try { throw [list FOO A B C D] bar  } trap {FOO A B C D} {} { list d e f }
} {d e f}

# simple try tests - variable assignment and result handling

test error-12.1 {try with no variable assignment in on handler} {
    try { throw FOO bar } on error {} { list d e f }
} {d e f}
test error-12.2 {try with result variable assignment in on handler} {
    try { throw FOO bar } on error {res} { set res }
} {bar}
test error-12.3 {try with result variable assignment in on handler, var remains in scope} {
    try { throw FOO bar } on error {res} { list d e f }
    set res
} {bar}
test error-12.4 {try with result/opts variable assignment in on handler} {
    try {
	throw FOO bar
    } on error {res opts} {
	set r "$res,[dict get $opts -errorcode]"
    }
} {bar,FOO}
test error-12.5 {try with result/opts variable assignment in on handler, vars remain in scope} {
    try { throw FOO bar } on error {res opts} { list d e f }
    set r "$res,[dict get $opts -errorcode]"  
} {bar,FOO}
test error-12.6 {try result is propagated if no matching handler} {
    try { list a b c } on error {} { list d e f }
} {a b c}
test error-12.7 {handler result is propagated if handler executes} {
    try { throw FOO bar } on error {} { list d e f }
} {d e f}

# negative case try tests - bad args to try

test error-13.1 {try with no arguments} -body {
    # warning: error message may change
    try
} -returnCodes error -match glob -result {wrong # args: *}
test error-13.2 {try with body only (ok)} {
    try list
} {}
test error-13.3 {try with missing finally body} -body {
    # warning: error message may change
    try list finally
} -returnCodes error -match glob -result {wrong # args to finally clause: *}
test error-13.4 {try with bad handler keyword} -body {
    # warning: error message may change
    try list then a b c
} -returnCodes error -match glob -result {bad handler *}
test error-13.5 {try with partial handler #1} -body {
    # warning: error message may change
    try list on
} -returnCodes error -match glob -result {wrong # args to on clause: *}
test error-13.6 {try with partial handler #2} -body {
    # warning: error message may change
    try list on error
} -returnCodes error -match glob -result {wrong # args to on clause: *}
test error-13.7 {try with partial handler #3} -body {
    # warning: error message may change
    try list on error {em opts}
} -returnCodes error -match glob -result {wrong # args to on clause: *}
test error-13.8 {try with multiple handlers and finally (ok)} {
    try list on error {} {} trap {} {} {} finally {}
} {}
test error-13.9 {last handler body can't be a fallthrough #1} -body {
    try list on error {} {} on break {} - 
} -returnCodes error -result {last non-finally clause must not have a body of "-"}
test error-13.10 {last handler body can't be a fallthrough #2} -body {
    try list on error {} {} on break {} - finally { list d e f }
} -returnCodes error -result {last non-finally clause must not have a body of "-"}

# try tests - multiple handlers (left-to-right matching, only one runs)

test error-14.1 {try with multiple handlers (only one matches) #1} {
    try { throw FOO bar } on ok {} { list a b c } trap FOO {} { list d e f }
} {d e f}
test error-14.2 {try with multiple handlers (only one matches) #2} {
    try { throw FOO bar } trap FOO {} { list d e f } on ok {} { list a b c } 
} {d e f}
test error-14.3 {try with multiple handlers (only one matches) #3} {
    try {
	throw FOO bar
    } on break {} {
	list x y z
    } trap FOO {} {
	list d e f
    } on ok {} {
	list a b c
    } 
} {d e f}
test error-14.4 {try with multiple matching handlers (only the first in left-to-right order runs) #1} {
    try { throw FOO bar } on error {} { list a b c } trap FOO {} { list d e f }
} {a b c}
test error-14.5 {try with multiple matching handlers (only the first in left-to-right order runs) #2} {
    try { throw FOO bar } trap FOO {} { list d e f } on error {} { list a b c }
} {d e f}
test error-14.6 {try with multiple matching handlers (only the first in left-to-right order runs) #3} {
    try { throw FOO bar } trap {} {} { list d e f } on 1 {} { list a b c }
} {d e f}
test error-14.7 {try with multiple matching handlers (only the first in left-to-right order runs) #4} {
    try { throw FOO bar } on 1 {} { list a b c } trap {} {} { list d e f }
} {a b c}
test error-14.8 {try with handler-of-last-resort "trap {}"} {
    try { throw FOO bar } trap FOX {} { list a b c } trap {} {} { list d e f }
} {d e f}
test error-14.9 {try with handler-of-last-resort "on error"} {
    try { foo } trap FOX {} { list a b c } on error {} { list d e f }
} {d e f}

# try tests - propagation (no matching handlers)

test error-15.1 {try with no handler (ok result propagates)} {
    try { list a b c }
} {a b c}
test error-15.2 {try with no matching handler (ok result propagates)} {
    try { list a b c } on error {} { list d e f }
} {a b c}
test error-15.3 {try with no handler (error result propagates)} -body {
    try { throw FOO bar }
} -returnCodes error -result {bar}
test error-15.4 {try with no matching handler (error result propagates)} -body {
    try { throw FOO bar } trap FOX {} { list a b c }
} -returnCodes error -result {bar}
test error-15.5 {try with no handler (return result propagates)} -body {
    try { return bar }
} -returnCodes 2 -result {bar}
test error-15.6 {try with no matching handler (break result propagates)} -body {
    try { if {1} break } on error {} { list a b c }
} -returnCodes 3 -result {}
test error-15.7 {try with no matching handler (unknown integer result propagates)} -body {
    try { return -level 0 -code 123456 } trap {} {} { list a b c }
} -returnCodes 123456 -result {}

foreach level {0 1 2 3} {
    foreach code {0 1 2 3 4 5} {

	# Following cases have different -errorinfo; avoid false alarms
	# TODO: examine whether these difference are as they ought to be.
	if {$level == 0 && $code == 1} continue

	foreach extras {{} {-bar soom}} {

test error-15.8.$level.$code.[llength $extras] {[try] coverage} {
    set script {return -level $level -code $code {*}$extras foo}
    catch $script m1 o1
    catch {try $script} m2 o2
    set o1 [lsort -stride 2 $o1]
    set o2 [lsort -stride 2 $o2]
    expr {$o1 eq $o2 ? "ok" : "$o1\n\tis not equal to\n$o2"}
} ok

test error-15.9.$level.$code.[llength $extras] {[try] coverage} {
    set script {return -level $level -code $code {*}$extras foo}
    catch $script m1 o1
    catch {try $script finally {}} m2 o2
    set o1 [lsort -stride 2 $o1]
    set o2 [lsort -stride 2 $o2]
    expr {$o1 eq $o2 ? "ok" : "$o1\n\tis not equal to\n$o2"}
} ok

test error-15.10.$level.$code.[llength $extras] {[try] coverage} {
    set script {return -level $level -code $code {*}$extras foo}
    catch $script m1 o1
    catch {try $script on $code {x y} {return -options $y $x}} m2 o2
    set o1 [lsort -stride 2 $o1]
    set o2 [lsort -stride 2 $o2]
    expr {$o1 eq $o2 ? "ok" : "$o1\n\tis not equal to\n$o2"}
} ok

	}
    }
}

# try tests - propagation (exceptions in handlers, exception chaining)

test error-16.1 {try with successfully executed handler} {
    try { throw FOO bar } trap FOO {} { list a b c }
} {a b c}
test error-16.2 {try with exception (error) in handler} -body {
    try { throw FOO bar } trap FOO {} { throw BAR foo }
} -returnCodes error -result {foo}
test error-16.3 {try with exception (return) in handler} -body {
    try { throw FOO bar } trap FOO {} { return BAR }
} -returnCodes 2 -result {BAR}
test error-16.4 {try with exception (break) in handler #1} -body {
    try { throw FOO bar } trap FOO {} { break }
} -returnCodes 3 -result {}
test error-16.5 {try with exception (break) in handler #2} {
    for { set i 5 } { $i < 10 } { incr i } {
	try { throw FOO bar } trap FOO {} { break }
    }
    set i
} {5}
test error-16.6 {try with variable assignment and propagation #1} {
    # Ensure that the handler variables preserve the exception off the
    # try-body, and are not modified by the exception off the handler
    catch {
	try { throw FOO bar } trap FOO {em} { throw BAR baz }
    }
    set em  
} {bar}
test error-16.7 {try with variable assignment and propagation #2} {
    catch {
	try { throw FOO bar } trap FOO {em opts} { throw BAR baz }
    }
    list $em [dict get $opts -errorcode]  
} {bar FOO}
test error-16.8 {exception chaining (try=ok, handler=error)} {
    #FIXME is the intent of this test correct?  
    catch {
	try { list a b c } on ok {em opts} { throw BAR baz }
    } tryem tryopts
    string equal $opts [dict get $tryopts -during]
} {1}
test error-16.9 {exception chaining (try=error, handler=error)} {
    # The exception off the handler should chain to the exception off the
    # try-body (using the -during option)
    catch {
	try { throw FOO bar } trap {} {em opts} { throw BAR baz }
    } tryem tryopts
    string equal $opts [dict get $tryopts -during]
} {1}
test error-16.10 {no exception chaining when handler is successful} {
    catch {
	try { throw FOO bar } trap {} {em opts} { list d e f }
    } tryem tryopts
    dict exists $tryopts -during
} {0}
test error-16.11 {no exception chaining when handler is a non-error exception} {
    catch {
	try { throw FOO bar } trap {} {em opts} { break }
    } tryem tryopts
    dict exists $tryopts -during
} {0}

# try tests - finally

test error-17.1 {finally always runs (try with ok result)} {
    set RES {}
    try { list a b c } finally { set RES done }
    set RES
} {done}
test error-17.2 {finally always runs (try with error result)} {
    set RES {}
    catch {
	try { throw FOO bar } finally { set RES done }
    }
    set RES
} {done}
test error-17.3 {finally always runs (try with matching handler)} {
    set RES {}
    try { throw FOO bar } trap FOO {} { list a b c } finally { set RES done }
    set RES
} {done}
test error-17.4 {finally always runs (try with exception in handler)} {
    set RES {}
    catch {
	try {
	    throw FOO bar
	} trap FOO {} {
	    throw BAR baz
	} finally {
	    set RES done
	}
    }
    set RES
} {done}
test error-17.5 {successful finally doesn't modify try outcome (try=ok)} {
    try { list a b c } finally { list d e f }
} {a b c}
test error-17.6 {successful finally doesn't modify try outcome (try=return)} -body {
    try { return c } finally { list d e f }
} -returnCodes 2 -result {c}
test error-17.7 {successful finally doesn't modify try outcome (try=error)} -body {
    try { error bar } finally { list d e f }
} -returnCodes 1 -result {bar}
test error-17.8 {successful finally doesn't modify handler outcome (handler=ok)} {
    try { throw FOO bar } trap FOO {} { list a b c } finally { list d e f }
} {a b c}
test error-17.9 {successful finally doesn't modify handler outcome (handler=error)} -body {
    try { throw FOO bar } trap FOO {} { throw BAR baz } finally { list d e f }
} -returnCodes error -result {baz}
test error-17.10 {successful finally doesn't affect variable assignment} {
    catch {
	try { throw FOO bar } trap FOO {em opts} { list d e f } finally { list d e f }
    } result
    list $em $result
} {bar {d e f}}
test error-17.11 {successful finally doesn't affect variable assignment or propagation} {
    catch {
	try { throw FOO bar } trap FOO {em opts} { throw BAR baz } finally { list d e f }
    }
    list $em [dict get $opts -errorcode]  
} {bar FOO}

# try tests - propagation (exceptions in finally, exception chaining)

test error-18.1 {try (ok) with exception in finally (error)} -body {
    try { list a b c } finally { throw BAR foo }
} -returnCodes error -result {foo}
test error-18.2 {try (error) with exception in finally (break)} -body {
    try { throw FOO bar } finally { break }
} -returnCodes 3 -result {}
test error-18.3 {try (ok) with handler (ok) and exception in finally (error)} -body {
    try { list a b c } on ok {} { list d e f } finally { throw BAR foo }
} -returnCodes error -result {foo}
test error-18.4 {try (error) with exception in handler (error) and in finally (arb code)} -body {
    try { throw FOO bar } on error {} { throw BAR baz } finally { return -level 0 -code 99 zing }
} -returnCodes 99 -result {zing}
test error-18.5 {exception in finally doesn't affect variable assignment} {
    catch {
	try { throw FOO bar } trap FOO {em opts} { throw BAR baz } finally { throw BAZ zing }
    }
    list $em [dict get $opts -errorcode]  
} {bar FOO}
test error-18.6 {exception chaining in finally (try=ok)} {
    catch {
	list a b c 
    } em expopts
    catch {
	try { list a b c } finally { throw BAR foo }
    } em opts
    string equal $expopts [dict get $opts -during]
} {1}
test error-18.7 {exception chaining in finally (try=error)} {
    catch {
	try { throw FOO bar } finally { throw BAR baz }
    } em opts
    dict get $opts -during -errorcode
} {FOO}
test error-18.8 {exception chaining in finally (try=ok, handler=ok)} {
    catch {
	try { list a b c } on ok {} { list d e f } finally { throw BAR baz }
    } em opts
    list [dict get $opts -during -code] [dict exists $opts -during -during]
} {0 0}
test error-18.9 {exception chaining in finally (try=error, handler=ok)} {
    catch {
	try {
	    throw FOO bar
	} on error {} {
	    list d e f
	} finally {
	    throw BAR baz
	}
    } em opts
    list [dict get $opts -during -code] [dict exists $opts -during -during]
} {0 0}
test error-18.10 {exception chaining in finally (try=error, handler=error)} {
    catch {
	try {
	    throw FOO bar
	} on error {} {
	    throw BAR baz
	} finally {
	    throw BAR baz
	}
    } em opts
    list [dict get $opts -during -errorcode] [dict get $opts -during -during -errorcode]
} {BAR FOO}
test error-18.11 {no exception chaining if finally produces a non-error exception} {
    catch {
	try { throw FOO bar } on error {} { throw BAR baz } finally { break }
    } em opts
    dict exists $opts -during
} {0}
test error-18.12 {variable assignment unaffected by exception in finally} {
    catch {
	try {
	    throw FOO bar
	} on error {em opts} {
	    list a b c
	} finally {
	    throw BAR baz
	}
    }
    list $em [dict get $opts -errorcode]
} {bar FOO}

# try tests - fallthough body cases

test error-19.1 {try with fallthrough body #1} {
    set RES {}
    try { list a b c } on ok { set RES 0 } - on error {} { set RES 1 }
    set RES
} {1}
test error-19.2 {try with fallthrough body #2} {
    set RES {}
    try { 
	throw FOO bar 
    } trap BAR {} {
    } trap FOO {} - trap {} {} {
	set RES foo
    } on error {} {
	set RES err
    }  
    set RES
} {foo}
test error-19.3 {try with cascade fallthrough} {
    set RES {}
    try {
	throw FOO bar
    } trap FOO {} - trap BAR {} - trap {} {} {
	set RES trap
    } on error {} { set RES err }
    set RES
} {trap}
test error-19.4 {multiple unrelated fallthroughs #1} {
    set RES {}
    try {
	throw FOO bar
    } trap FOO {} - trap BAR {} { 
	set RES foo
    } trap {} {} - on error {} {
	set RES err
    } 
    set RES
} {foo}
test error-19.5 {multiple unrelated fallthroughs #2} {
    set RES {}
    try {
	throw BAZ zing
    } trap FOO {} - trap BAR {} { 
	set RES foo
    } trap {} {} - on error {} {
	set RES err
    } 
    set RES
} {err}

# FIXME test what vars get set on fallthough ... what is the correct behavior?
# It would seem appropriate to set at least those for the matching handler and
# the executed body; possibly for each handler we fall through as well?

# negative case try tests - bad "on" handler

test error-20.1 {bad code name in on handler} -body {
    try { list a b c } on foo {} {}
} -returnCodes error -match glob -result {bad code *}
test error-20.2 {bad code value in on handler} -body {
    try { list a b c } on 34985723094872345 {} {}
} -returnCodes error -match glob -result {bad code *}

# negative case try tests - bad "trap" handler
# what is the effect if we attempt to trap an errorcode that is not a list?
# nested try
# catch inside try
# no tests for bad varslist?
# -errorcode but code!=1 doesn't trap
# throw negative case tests (no args, too many args, etc)

}
namespace delete ::tcl::test::error

# cleanup
catch {rename p ""}
::tcltest::cleanupTests
return 

# Local Variables:
# mode: tcl
# End: