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source [file dirname [info script]]/testing.tcl
needs constraint jim
needs cmd tailcall
needs cmd try tclcompat
test tailcall-1.1 {Basic tailcall} {
# Demo -- a tail-recursive factorial function
proc fac {x {val 1}} {
if {$x <= 2} {
expr {$x * $val}
} else {
tailcall fac [expr {$x -1}] [expr {$x * $val}]
}
}
fac 10
} {3628800}
test tailcall-1.2 {Tailcall in try} {
set x 0
proc a {} { upvar x x; incr x }
proc b {} { upvar x x; incr x 4; try { tailcall a } finally { incr x 8 }}
b
set x
} {13}
test tailcall-1.3 {Tailcall does return} {
set x 0
proc a {} { upvar x x; incr x }
proc b {} { upvar x x; incr x 4; tailcall a; incr x 8}
b
set x
} {5}
test tailcall-1.4 {uplevel tailcall} {
proc a {} { set ::y [info level] }
proc b {} { set ::x [info level]; uplevel 1 tailcall a}
b
list $x $y
} {1 1}
test tailcall-1.5 {interaction of uplevel and tailcall} {
proc a {cmd} {
tailcall $cmd
}
proc b {} {
lappend result [uplevel 1 a c]
lappend result [uplevel 1 a c]
}
proc c {} {
return c
}
a b
} {c c}
testreport
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