(command.CommandList children: [ (command.ShFunction name: test_terminal body: (BraceGroup children: [ (command.If arms: [ (if_arm cond: [(command.Pipeline children:[(C {<test_declared_prereq>} {<TTY>})] negated:T)] action: [ (command.Simple words: [{<echo>} {(DQ <'test_terminal: need to declare TTY prerequisite'>)}] redirects: [(redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<4>})] do_fork: T ) (command.ControlFlow token: <Id.ControlFlow_Return return> arg_word: {<127>} ) ] spids: [21 30] ) ] ) (C {<perl>} {(DQ ($ Id.VSub_DollarName '$TEST_DIRECTORY')) <'/test-terminal.perl'>} {(DQ ($ Id.VSub_At '$@'))} ) ] ) ) (C {<test_lazy_prereq>} {<TTY>} { (SQ <'\n'> <'\ttest_have_prereq PERL &&\n'> <'\n'> <'\t# Reading from the pty master seems to get stuck _sometimes_\n'> <'\t# on Mac OS X 10.5.0, using Perl 5.10.0 or 5.8.9.\n'> <'\t#\n'> <'\t# Reproduction recipe: run\n'> <'\t#\n'> <'\t#\ti=0\n'> <'\t#\twhile ./test-terminal.perl echo hi $i\n'> <'\t#\tdo\n'> <'\t#\t\t: $((i = $i + 1))\n'> <'\t#\tdone\n'> <'\t#\n'> <'\t# After 2000 iterations or so it hangs.\n'> <'\t# https://rt.cpan.org/Ticket/Display.html?id=65692\n'> <'\t#\n'> <'\ttest "$(uname -s)" != Darwin &&\n'> <'\n'> <'\tperl "$TEST_DIRECTORY"/test-terminal.perl \\\n'> <'\t\tsh -c "test -t 1 && test -t 2"\n'> ) } ) ] )