[notes]
Regression test for "Getter for context is not a list when it should be".
https://github.com/antlr/antlr4/issues/19

[type]
Parser

[grammar]
grammar T;
@parser::members{
<DeclareContextListGettersFunction()>
}
s : (a | b)+;
a : 'a' {<write("\"a\"")>};
b : 'b' {<write("\"b\"")>};

[start]
s

[input]
abab

[output]
"""abab"""