tcl/tests/if.test

# Commands covered:  if
#
# 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) 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: if.test,v 1.7 2001/12/04 15:36:29 dkf Exp $

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

# Basic "if" operation.

catch {unset a}
test if-1.1 {TclCompileIfCmd: missing if/elseif test} {
    list [catch {if} msg] $msg
} {1 {wrong # args: no expression after "if" argument}}
test if-1.2 {TclCompileIfCmd: error in if/elseif test} {
    list [catch {if {[error "error in condition"]} foo} msg] $msg
} {1 {error in condition}}
test if-1.3 {TclCompileIfCmd: error in if/elseif test} {
    list [catch {if {1+}} msg] $msg $errorInfo
} {1 {syntax error in expression "1+": premature end of expression} {syntax error in expression "1+": premature end of expression
    ("if" test expression)
    while compiling
"if {1+}"}}
test if-1.4 {TclCompileIfCmd: if/elseif test in braces} {
    set a {}
    if {1<2} {set a 1}
    set a
} {1}
test if-1.5 {TclCompileIfCmd: if/elseif test not in braces} {
    set a {}
    if 1<2 {set a 1}
    set a
} {1}
test if-1.6 {TclCompileIfCmd: multiline test expr} {
    set a {}
    if {($tcl_platform(platform) != "foobar1") && \
	($tcl_platform(platform) != "foobar2")} {set a 3} else {set a 4}
    set a
} 3
test if-1.7 {TclCompileIfCmd: "then" after if/elseif test} {
    set a {}
    if 4>3 then {set a 1}
    set a
} {1}
test if-1.8 {TclCompileIfCmd: keyword other than "then" after if/elseif test} {
    set a {}
    catch {if 1<2 therefore {set a 1}} msg
    set msg
} {invalid command name "therefore"}
test if-1.9 {TclCompileIfCmd: missing "then" body} {
    set a {}
    catch {if 1<2 then} msg
    set msg
} {wrong # args: no script following "then" argument}
test if-1.10 {TclCompileIfCmd: error in "then" body} {
    set a {}
    list [catch {if {$a!="xxx"} then {set}} msg] $msg $errorInfo
} {1 {wrong # args: should be "set varName ?newValue?"} {wrong # args: should be "set varName ?newValue?"
    while compiling
"set"
    ("if" then script line 1)
    while compiling
"if {$a!="xxx"} then {set}"}}
test if-1.11 {TclCompileIfCmd: error in "then" body} {
    list [catch {if 2 then {[error "error in then clause"]}} msg] $msg
} {1 {error in then clause}}
test if-1.12 {TclCompileIfCmd: "then" body in quotes} {
    set a {}
    if 27>17 "append a x"
    set a
} {x}
test if-1.13 {TclCompileIfCmd: computed "then" body} {
    catch {unset x1}
    catch {unset x2}
    set a {}
    set x1 {append a x1}
    set x2 {; append a x2}
    set a {}
    if 1 $x1$x2
    set a
} {x1x2}
test if-1.14 {TclCompileIfCmd: taking proper branch} {
    set a {}
    if 1<2 {set a 1}
    set a
} 1
test if-1.15 {TclCompileIfCmd: taking proper branch} {
    set a {}
    if 1>2 {set a 1}
    set a
} {}
test if-1.16 {TclCompileIfCmd: test jumpFalse instruction replacement after long "then" body} {
    catch {unset i}
    set a {}
    if 1<2 {
	set a 1
	while {$a != "xxx"} {
	    break;
	    while {$i >= 0} {
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		set i [expr $i-1]
	    }
	}
	set a 2
	while {$a != "xxx"} {
	    break;
	    while {$i >= 0} {
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		set i [expr $i-1]
	    }
	}
	set a 3
    }
    set a
} 3
test if-1.17 {TclCompileIfCmd: if/elseif test in quotes} {
    set a {}
    list [catch {if {"0 < 3"} {set a 1}} msg] $msg
} {1 {expected boolean value but got "0 < 3"}}


test if-2.1 {TclCompileIfCmd: "elseif" after if/elseif test} {
    set a {}
    if 3>4 {set a 1} elseif 1 {set a 2}
    set a
} {2}
# Since "else" is optional, the "elwood" below is treated as a command.
# But then there shouldn't be any additional argument words for the "if".
test if-2.2 {TclCompileIfCmd: keyword other than "elseif"} {
    set a {}
    catch {if 1<2 {set a 1} elwood {set a 2}} msg
    set msg
} {wrong # args: extra words after "else" clause in "if" command}
test if-2.3 {TclCompileIfCmd: missing expression after "elseif"} {
    set a {}
    catch {if 1<2 {set a 1} elseif} msg
    set msg
} {wrong # args: no expression after "elseif" argument}
test if-2.4 {TclCompileIfCmd: error in expression after "elseif"} {
    set a {}
    list [catch {if 3>4 {set a 1} elseif {1>}} msg] $msg $errorInfo
} {1 {syntax error in expression "1>": premature end of expression} {syntax error in expression "1>": premature end of expression
    ("if" test expression)
    while compiling
"if 3>4 {set a 1} elseif {1>}"}}
test if-2.5 {TclCompileIfCmd: test jumpFalse instruction replacement after long "elseif" body} {
    catch {unset i}
    set a {}
    if 1>2 {
	set a 1
	while {$a != "xxx"} {
	    break;
	    while {$i >= 0} {
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		set i [expr $i-1]
	    }
	}
	set a 2
	while {$a != "xxx"} {
	    break;
	    while {$i >= 0} {
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		set i [expr $i-1]
	    }
	}
	set a 3
    } elseif 1<2 then { #; this if arm should be taken
	set a 4
	while {$a != "xxx"} {
	    break;
	    while {$i >= 0} {
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		set i [expr $i-1]
	    }
	}
	set a 5
	while {$a != "xxx"} {
	    break;
	    while {$i >= 0} {
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		set i [expr $i-1]
	    }
	}
	set a 6
    }
    set a
} 6

test if-3.1 {TclCompileIfCmd: "else" clause} {
    set a {}
    if 3>4 {set a 1} elseif {$a == "foo"} {set a 2} else {set a 3}
    set a
} 3
# Since "else" is optional, the "elsex" below is treated as a command.
# But then there shouldn't be any additional argument words for the "if".
test if-3.2 {TclCompileIfCmd: keyword other than "else"} {
    set a {}
    catch {if 1<2 then {set a 1} elsex {set a 2}} msg
    set msg
} {wrong # args: extra words after "else" clause in "if" command}
test if-3.3 {TclCompileIfCmd: missing body after "else"} {
    set a {}
    catch {if 2<1 {set a 1} else} msg
    set msg
} {wrong # args: no script following "else" argument}
test if-3.4 {TclCompileIfCmd: error compiling body after "else"} {
    set a {}
    catch {if 2<1 {set a 1} else {set}} msg
    set errorInfo
} {wrong # args: should be "set varName ?newValue?"
    while compiling
"set"
    ("if" else script line 1)
    while compiling
"if 2<1 {set a 1} else {set}"}
test if-3.5 {TclCompileIfCmd: extra arguments after "else" argument} {
    set a {}
    catch {if 2<1 {set a 1} else {set a 2} or something} msg
    set msg
} {wrong # args: extra words after "else" clause in "if" command}
# The following test also checks whether contained loops and other
# commands are properly relocated because a short jump must be replaced
# by a "long distance" one.
test if-3.6 {TclCompileIfCmd: test jumpFalse instruction replacement after long "else" clause} {
    catch {unset i}
    set a {}
    if 1>2 {
	set a 1
	while {$a != "xxx"} {
	    break;
	    while {$i >= 0} {
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		set i [expr $i-1]
	    }
	}
	set a 2
	while {$a != "xxx"} {
	    break;
	    while {$i >= 0} {
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		set i [expr $i-1]
	    }
	}
	set a 3
    } elseif 1==2 then { #; this if arm should be taken
	set a 4
	while {$a != "xxx"} {
	    break;
	    while {$i >= 0} {
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		set i [expr $i-1]
	    }
	}
	set a 5
	while {$a != "xxx"} {
	    break;
	    while {$i >= 0} {
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		set i [expr $i-1]
	    }
	}
	set a 6
    } else {
	set a 7
	while {$a != "xxx"} {
	    break;
	    while {$i >= 0} {
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		set i [expr $i-1]
	    }
	}
	set a 8
	while {$a != "xxx"} {
	    break;
	    while {$i >= 0} {
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		if {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		set i [expr $i-1]
	    }
	}
	set a 9
    }
    set a
} 9

test if-4.1 {TclCompileIfCmd: "if" command result} {
    set a {}
    set a [if 3<4 {set i 27}]
    set a
} 27
test if-4.2 {TclCompileIfCmd: "if" command result} {
    set a {}
    set a [if 3>4 {set i 27}]
    set a
} {}
test if-4.3 {TclCompileIfCmd: "if" command result} {
    set a {}
    set a [if 0 {set i 1} elseif 1 {set i 2}]
    set a
} 2
test if-4.4 {TclCompileIfCmd: "if" command result} {
    set a {}
    set a [if 0 {set i 1} elseif 0 {set i 2} elseif 2>5 {set i 3} else {set i 4}]
    set a
} 4
test if-4.5 {TclCompileIfCmd: return value} {
    if 0 then {set a 22; concat abc} elseif 1 {concat def} {concat ghi}
} def

# Check "if" and computed command names.

catch {unset a}
test if-5.1 {if cmd with computed command names: missing if/elseif test} {
    set z if
    list [catch {$z} msg] $msg
} {1 {wrong # args: no expression after "if" argument}}

test if-5.2 {if cmd with computed command names: error in if/elseif test} {
    set z if
    list [catch {$z {[error "error in condition"]} foo} msg] $msg
} {1 {error in condition}}
test if-5.3 {if cmd with computed command names: error in if/elseif test} {
    set z if
    list [catch {$z {1+}} msg] $msg $errorInfo
} {1 {syntax error in expression "1+": premature end of expression} {syntax error in expression "1+": premature end of expression
    while executing
"$z {1+}"}}
test if-5.4 {if cmd with computed command names: if/elseif test in braces} {
    set z if
    set a {}
    $z {1<2} {set a 1}
    set a
} {1}
test if-5.5 {if cmd with computed command names: if/elseif test not in braces} {
    set z if
    set a {}
    $z 1<2 {set a 1}
    set a
} {1}
test if-5.6 {if cmd with computed command names: multiline test expr} {
    set z if
    set a {}
    $z {($tcl_platform(platform) != "foobar1") && \
	($tcl_platform(platform) != "foobar2")} {set a 3} else {set a 4}
    set a
} 3
test if-5.7 {if cmd with computed command names: "then" after if/elseif test} {
    set z if
    set a {}
    $z 4>3 then {set a 1}
    set a
} {1}
test if-5.8 {if cmd with computed command names: keyword other than "then" after if/elseif test} {
    set z if
    set a {}
    catch {$z 1<2 therefore {set a 1}} msg
    set msg
} {invalid command name "therefore"}
test if-5.9 {if cmd with computed command names: missing "then" body} {
    set z if
    set a {}
    catch {$z 1<2 then} msg
    set msg
} {wrong # args: no script following "then" argument}
test if-5.10 {if cmd with computed command names: error in "then" body} {
    set z if
    set a {}
    list [catch {$z {$a!="xxx"} then {set}} msg] $msg $errorInfo
} {1 {wrong # args: should be "set varName ?newValue?"} {wrong # args: should be "set varName ?newValue?"
    while compiling
"set"
    invoked from within
"$z {$a!="xxx"} then {set}"}}
test if-5.11 {if cmd with computed command names: error in "then" body} {
    set z if
    list [catch {$z 2 then {[error "error in then clause"]}} msg] $msg
} {1 {error in then clause}}
test if-5.12 {if cmd with computed command names: "then" body in quotes} {
    set z if
    set a {}
    $z 27>17 "append a x"
    set a
} {x}
test if-5.13 {if cmd with computed command names: computed "then" body} {
    set z if
    catch {unset x1}
    catch {unset x2}
    set a {}
    set x1 {append a x1}
    set x2 {; append a x2}
    set a {}
    $z 1 $x1$x2
    set a
} {x1x2}
test if-5.14 {if cmd with computed command names: taking proper branch} {
    set z if
    set a {}
    $z 1<2 {set a 1}
    set a
} 1
test if-5.15 {if cmd with computed command names: taking proper branch} {
    set z if
    set a {}
    $z 1>2 {set a 1}
    set a
} {}
test if-5.16 {if cmd with computed command names: test jumpFalse instruction replacement after long "then" body} {
    set z if
    catch {unset i}
    set a {}
    $z 1<2 {
	set a 1
	while {$a != "xxx"} {
	    break;
	    while {$i >= 0} {
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		set i [expr $i-1]
	    }
	}
	set a 2
	while {$a != "xxx"} {
	    break;
	    while {$i >= 0} {
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		set i [expr $i-1]
	    }
	}
	set a 3
    }
    set a
} 3
test if-5.17 {if cmd with computed command names: if/elseif test in quotes} {
    set z if
    set a {}
    list [catch {$z {"0 < 3"} {set a 1}} msg] $msg
} {1 {expected boolean value but got "0 < 3"}}


test if-6.1 {if cmd with computed command names: "elseif" after if/elseif test} {
    set z if
    set a {}
    $z 3>4 {set a 1} elseif 1 {set a 2}
    set a
} {2}
# Since "else" is optional, the "elwood" below is treated as a command.
# But then there shouldn't be any additional argument words for the "if".
test if-6.2 {if cmd with computed command names: keyword other than "elseif"} {
    set z if
    set a {}
    catch {$z 1<2 {set a 1} elwood {set a 2}} msg
    set msg
} {wrong # args: extra words after "else" clause in "if" command}
test if-6.3 {if cmd with computed command names: missing expression after "elseif"} {
    set z if
    set a {}
    catch {$z 1<2 {set a 1} elseif} msg
    set msg
} {wrong # args: no expression after "elseif" argument}
test if-6.4 {if cmd with computed command names: error in expression after "elseif"} {
    set z if
    set a {}
    list [catch {$z 3>4 {set a 1} elseif {1>}} msg] $msg $errorInfo
} {1 {syntax error in expression "1>": premature end of expression} {syntax error in expression "1>": premature end of expression
    while executing
"$z 3>4 {set a 1} elseif {1>}"}}
test if-6.5 {if cmd with computed command names: test jumpFalse instruction replacement after long "elseif" body} {
    set z if
    catch {unset i}
    set a {}
    $z 1>2 {
	set a 1
	while {$a != "xxx"} {
	    break;
	    while {$i >= 0} {
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		set i [expr $i-1]
	    }
	}
	set a 2
	while {$a != "xxx"} {
	    break;
	    while {$i >= 0} {
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		set i [expr $i-1]
	    }
	}
	set a 3
    } elseif 1<2 then { #; this if arm should be taken
	set a 4
	while {$a != "xxx"} {
	    break;
	    while {$i >= 0} {
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		set i [expr $i-1]
	    }
	}
	set a 5
	while {$a != "xxx"} {
	    break;
	    while {$i >= 0} {
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		set i [expr $i-1]
	    }
	}
	set a 6
    }
    set a
} 6

test if-7.1 {if cmd with computed command names: "else" clause} {
    set z if
    set a {}
    $z 3>4 {set a 1} elseif {$a == "foo"} {set a 2} else {set a 3}
    set a
} 3
# Since "else" is optional, the "elsex" below is treated as a command.
# But then there shouldn't be any additional argument words for the "if".
test if-7.2 {if cmd with computed command names: keyword other than "else"} {
    set z if
    set a {}
    catch {$z 1<2 then {set a 1} elsex {set a 2}} msg
    set msg
} {wrong # args: extra words after "else" clause in "if" command}
test if-7.3 {if cmd with computed command names: missing body after "else"} {
    set z if
    set a {}
    catch {$z 2<1 {set a 1} else} msg
    set msg
} {wrong # args: no script following "else" argument}
test if-7.4 {if cmd with computed command names: error compiling body after "else"} {
    set z if
    set a {}
    catch {$z 2<1 {set a 1} else {set}} msg
    set errorInfo
} {wrong # args: should be "set varName ?newValue?"
    while compiling
"set"
    invoked from within
"$z 2<1 {set a 1} else {set}"}
test if-7.5 {if cmd with computed command names: extra arguments after "else" argument} {
    set z if
    set a {}
    catch {$z 2<1 {set a 1} else {set a 2} or something} msg
    set msg
} {wrong # args: extra words after "else" clause in "if" command}
# The following test also checks whether contained loops and other
# commands are properly relocated because a short jump must be replaced
# by a "long distance" one.
test if-7.6 {if cmd with computed command names: test jumpFalse instruction replacement after long "else" clause} {
    set z if
    catch {unset i}
    set a {}
    $z 1>2 {
	set a 1
	while {$a != "xxx"} {
	    break;
	    while {$i >= 0} {
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		set i [expr $i-1]
	    }
	}
	set a 2
	while {$a != "xxx"} {
	    break;
	    while {$i >= 0} {
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		set i [expr $i-1]
	    }
	}
	set a 3
    } elseif 1==2 then { #; this if arm should be taken
	set a 4
	while {$a != "xxx"} {
	    break;
	    while {$i >= 0} {
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		set i [expr $i-1]
	    }
	}
	set a 5
	while {$a != "xxx"} {
	    break;
	    while {$i >= 0} {
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		set i [expr $i-1]
	    }
	}
	set a 6
    } else {
	set a 7
	while {$a != "xxx"} {
	    break;
	    while {$i >= 0} {
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		set i [expr $i-1]
	    }
	}
	set a 8
	while {$a != "xxx"} {
	    break;
	    while {$i >= 0} {
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		$z {[string compare $a "bar"] < 0} {
		    set i $i
		    set i [lindex $s $i]
		}
		set i [expr $i-1]
	    }
	}
	set a 9
    }
    set a
} 9

test if-8.1 {if cmd with computed command names: "if" command result} {
    set z if
    set a {}
    set a [$z 3<4 {set i 27}]
    set a
} 27
test if-8.2 {if cmd with computed command names: "if" command result} {
    set z if
    set a {}
    set a [$z 3>4 {set i 27}]
    set a
} {}
test if-8.3 {if cmd with computed command names: "if" command result} {
    set z if
    set a {}
    set a [$z 0 {set i 1} elseif 1 {set i 2}]
    set a
} 2
test if-8.4 {if cmd with computed command names: "if" command result} {
    set z if
    set a {}
    set a [$z 0 {set i 1} elseif 0 {set i 2} elseif 2>5 {set i 3} else {set i 4}]
    set a
} 4
test if-8.5 {if cmd with computed command names: return value} {
    set z if
    $z 0 then {set a 22; concat abc} elseif 1 {concat def} {concat ghi}
} def

test if-9.1 {if cmd with namespace qualifiers} {
    ::if {1} {set x 4}
} 4

# Test for incorrect "double evaluation semantics"

test if-10.1 {delayed substitution of then body} {
    set j 0
    set if if
    # this is not compiled
    $if {[incr j] == 1} "
       set result $j
    "
    # this will be compiled
    proc p {} {
	set j 0
	if {[incr j]} "
	    set result $j
	"
	set result
    }
    append result [p]
} {00}
test if-10.2 {delayed substitution of elseif expression} {
    set j 0
    set if if
    # this is not compiled
    $if {[incr j] == 0} {
       set result badthen
    } elseif "$j == 1" {
       set result badelseif
    } else {
       set result 0
    }
    # this will be compiled
    proc p {} {
	set j 0
	if {[incr j] == 0} {
	    set result badthen
	} elseif "$j == 1" {
	    set result badelseif
	} else {
	    set result 0
	}
	set result
    }
    append result [p]
} {00}
test if-10.3 {delayed substitution of elseif body} {
    set j 0
    set if if
    # this is not compiled
    $if {[incr j] == 0} {
       set result badthen
    } elseif {1} "
       set result $j
    "
    # this will be compiled
    proc p {} {
	set j 0
	if {[incr j] == 0} {
	    set result badthen
	} elseif {1} "
	    set result $j
	"
    }
    append result [p]
} {00}
test if-10.4 {delayed substitution of else body} {
    set j 0
    if {[incr j] == 0} {
       set result badthen
    } else "
       set result $j
    "
    set result
} {0}
test if-10.5 {substituted control words} {
    set then then; proc then {} {return badthen}
    set else else; proc else {} {return badelse}
    set elseif elseif; proc elseif {} {return badelseif}
    list [catch {if 1 $then {if 0 {} $elseif 1 {if 0 {} $else {list ok}}}} a] $a
} {0 ok}
test if-10.6 {double invocation of variable traces} {
    set iftracecounter 0
    proc iftraceproc {args} {
       upvar #0 iftracecounter counter
       set argc [llength $args]
       set extraargs [lrange $args 0 [expr {$argc - 4}]]
       set name [lindex $args [expr {$argc - 3}]]
       upvar 1 $name var
       if {[incr counter] % 2 == 1} {
           set var "$counter oops [concat $extraargs]"
       } else {
           set var "$counter + [concat $extraargs]"
       }
    }
    trace variable iftracevar r [list iftraceproc 10]
    list [catch {if "$iftracevar + 20" {}} a] $a \
        [catch {if "$iftracevar + 20" {}} b] $b \
        [unset iftracevar iftracecounter]
} {1 {syntax error in expression "1 oops 10 + 20": extra tokens at end of expression} 0 {} {}}

# cleanup
::tcltest::cleanupTests
return