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Command subsisution with backticks is incorrectly parsed when theres a space after the tick #278
Description
This example code here
echo `echo "foo"`
echo `echo "bar"`gets correctly parsed as
program [0, 0] - [3, 0]
command [0, 0] - [0, 17]
name: command_name [0, 0] - [0, 4]
word [0, 0] - [0, 4]
argument: command_substitution [0, 5] - [0, 17]
command [0, 6] - [0, 16]
name: command_name [0, 6] - [0, 10]
word [0, 6] - [0, 10]
argument: string [0, 11] - [0, 16]
string_content [0, 12] - [0, 15]
command [2, 0] - [2, 17]
name: command_name [2, 0] - [2, 4]
word [2, 0] - [2, 4]
argument: command_substitution [2, 5] - [2, 17]
command [2, 6] - [2, 16]
name: command_name [2, 6] - [2, 10]
word [2, 6] - [2, 10]
argument: string [2, 11] - [2, 16]
string_content [2, 12] - [2, 15]
but if a space is added in the backtick on the second line then it gets incorrectly parsed
echo `echo "foo"`
echo ` echo "bar"`program [0, 0] - [3, 0]
command [0, 0] - [2, 18]
name: command_name [0, 0] - [0, 4]
word [0, 0] - [0, 4]
# Now the substitution continues onto the second line of code instead of ending at the first
argument: command_substitution [0, 5] - [2, 18]
command [0, 6] - [2, 17]
name: command_name [0, 6] - [0, 10]
word [0, 6] - [0, 10]
argument: concatenation [0, 11] - [2, 6]
string [0, 11] - [0, 16]
string_content [0, 12] - [0, 15]
command_substitution [0, 16] - [2, 6]
command [2, 0] - [2, 4]
name: command_name [2, 0] - [2, 4]
word [2, 0] - [2, 4]
argument: word [2, 7] - [2, 11]
argument: string [2, 12] - [2, 17]
string_content [2, 13] - [2, 16]
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