lexer: Fix negative 'n0' and 'n1' in lex_source_contains_macro_call().
[pspp] / doc / pspp-figures / tutorial4.sps
1 get file='hotel.sav'.
2 compute v3 = 6 - v3.
3 compute v5 = 6 - v5.
4 reliability variables=v1, v3, v4.