hush_test/hush-bugs/and_or_and_backgrounding.tests

# UNFIXED BUG: hush thinks that ; && || & have the same precedence.
# According to this doc, && || have higher precedence than ; &.
# See example below.
# Precedence of ; is not a problem in practice. Precedence of & is.
#
#http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html
#
#2.9.3 Lists
#
#An AND-OR list is a sequence of one or more pipelines separated by
#the operators "&&" and "||" .
#
#A list is a sequence of one or more AND-OR lists separated by the operators
#';' and '&' and optionally terminated by ';', '&', or <newline>.
#
#The operators "&&" and "||" shall have equal precedence and shall be
#evaluated with left associativity. For example, both of the following
#commands write solely bar to standard output:
#
#    false && echo foo || echo bar
#    true || echo foo && echo bar
#
#A ';' or <newline> terminator shall cause the preceding AND-OR list
#to be executed sequentially; an '&' shall cause asynchronous execution
#of the preceding AND-OR list.

echo First && sleep 0.2 && echo Third &
sleep 0.1
echo Second
wait
echo Done
1	niro	984	# UNFIXED BUG: hush thinks that ; && \|\| & have the same precedence.
2			# According to this doc, && \|\| have higher precedence than ; &.
3			# See example below.
4			# Precedence of ; is not a problem in practice. Precedence of & is.
5			#
6			#http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html
7			#
8			#2.9.3 Lists
9			#
10			#An AND-OR list is a sequence of one or more pipelines separated by
11			#the operators "&&" and "\|\|" .
12			#
13			#A list is a sequence of one or more AND-OR lists separated by the operators
14			#';' and '&' and optionally terminated by ';', '&', or <newline>.
15			#
16			#The operators "&&" and "\|\|" shall have equal precedence and shall be
17			#evaluated with left associativity. For example, both of the following
18			#commands write solely bar to standard output:
19			#
20			# false && echo foo \|\| echo bar
21			# true \|\| echo foo && echo bar
22			#
23			#A ';' or <newline> terminator shall cause the preceding AND-OR list
24			#to be executed sequentially; an '&' shall cause asynchronous execution
25			#of the preceding AND-OR list.
26
27			echo First && sleep 0.2 && echo Third &
28			sleep 0.1
29			echo Second
30			wait
31			echo Done