Merge branch 'fix' into 'master'

Add ident/lit prefixes to .out files

See merge request IPDSnelting/mjtest-tests!6

lexer/leading_zero.mj.out

-0
-123
+integer literal 0
+integer literal 123
 EOF

lexer/numerical_token.mj.out

-123
-a
+integer literal 123
+identifier a
 EOF