""
"foo\"b\\ar"
"f''o'o'\"bar"
"foo
bar"
"foo ${ 42 } baz"
"foo \${ 42 } baz"

''''
''
foo
bar
''
''
f'oo'''ba'r
foo ${ 42 } baz
foo ''${ 42 } baz
''

----------------------------------------------------

[
	["string", ["\"\""]],
	["string", ["\"foo\\\"b\\\\ar\""]],
	["string", ["\"f''o'o'\\\"bar\""]],
	["string", ["\"foo\r\nbar\""]],
	["string", [
		"\"foo ",
		["interpolation", [
			["antiquotation", "$"],
			["punctuation", "{"],
			["number", "42"],
			["punctuation", "}"]
		]],
		" baz\""
	]],
	["string", ["\"foo \\${ 42 } baz\""]],

	["string", ["''''"]],
	["string", ["''\r\nfoo\r\nbar\r\n''"]],
	["string", [
		"''\r\nf'oo'''ba'r\r\nfoo ",
		["interpolation", [
			["antiquotation", "$"],
			["punctuation", "{"],
			["number", "42"],
			["punctuation", "}"]
		]],
		" baz\r\nfoo ''${ 42 } baz\r\n''"
	]]
]

----------------------------------------------------

Checks for strings and string interpolation.
Also checks that escaped interpolations are not interpreted.