Returns true if there exists a multiline string literal between the start
of token start_token and the start of token end_token.
fn hasMultilineString(tree: Ast, start_token: Ast.TokenIndex, end_token: Ast.TokenIndex) bool
fn hasMultilineString(tree: Ast, start_token: Ast.TokenIndex, end_token: Ast.TokenIndex) bool {
return std.mem.findScalar(
Token.Tag,
tree.tokens.items(.tag)[start_token..end_token],
.multiline_string_literal_line,
) != null;
}