binary scan $d H* hd
    lappend hd [catch {read $f} msg]
    close $f
    lappend hd $msg
} -cleanup {
    removeFile io-75.6
} -match glob -result {41 1 {error reading "*": illegal byte sequence}}

test io-75.7 {invalid utf-8 encoding eof handling (-strictencoding 1)} -setup {
    set fn [makeFile {} io-75.7]
    set f [open $fn w+]
    fconfigure $f -encoding binary
    # \x81 is invalid in utf-8. -eofchar is not detected, because it comes later.
    puts -nonewline $f "A\x81\x1A"
    flush $f
    seek $f 0
    fconfigure $f -encoding utf-8 -buffering none -eofchar \x1A -translation lf -strictencoding 1
} -body {
    set d [read $f]
    binary scan $d H* hd
    lappend hd [eof $f]
    lappend hd [catch {read $f} msg]
    close $f
    lappend hd $msg
} -cleanup {
    removeFile io-75.6
} -match glob -result {41 0 1 {error reading "*": illegal byte sequence}}

test io-75.8 {invalid utf-8 encoding eof handling (-strictencoding 1)} -setup {
    set fn [makeFile {} io-75.8]
    set f [open $fn w+]
    fconfigure $f -encoding binary
    # \x81 is invalid in utf-8, but since \x1A comes first, -eofchar takes precedence.
    puts -nonewline $f "A\x1A\x81"
    flush $f
    seek $f 0
    fconfigure $f -encoding utf-8 -buffering none -eofchar \x1A -translation lf -strictencoding 1
} -body {
    set d [read $f]
    binary scan $d H* hd
    lappend hd [eof $f]
    lappend hd [read $f]
    close $f
    set hd
} -cleanup {
    removeFile io-75.6
} -result {41 1 {}}

# ### ### ### ######### ######### #########



test io-76.0 {channel modes} -setup {
    set datafile [makeFile {some characters} dummy]