set x [list [catch {open ~/foo} msg] $msg]
    set ::env(HOME) $home
    set x
} {1 {couldn't open "~/foo": no such file or directory}}

test io-41.1 {Tcl_FileeventCmd: errors} {fileevent} {
    list [catch {fileevent foo} msg] $msg
} {1 {wrong # args: should be "fileevent channelId event ?script?"}}
} {1 {wrong # args: should be "fileevent channel event ?script?"}}
test io-41.2 {Tcl_FileeventCmd: errors} {fileevent} {
    list [catch {fileevent foo bar baz q} msg] $msg
} {1 {wrong # args: should be "fileevent channelId event ?script?"}}
} {1 {wrong # args: should be "fileevent channel event ?script?"}}
test io-41.3 {Tcl_FileeventCmd: errors} {fileevent} {
    list [catch {fileevent gorp readable} msg] $msg
} {1 {can not find channel named "gorp"}}
test io-41.4 {Tcl_FileeventCmd: errors} {fileevent} {
    list [catch {fileevent gorp writable} msg] $msg
} {1 {can not find channel named "gorp"}}
test io-41.5 {Tcl_FileeventCmd: errors} {fileevent} {