in sebastianbergmann/php-code-coverage#1125 we can see the token-names for tokenizing the file https://github.com/sebastianbergmann/php-code-coverage/blob/555cd5e6f887648198b96ed89c6880d6f61a0733/tests/_files/source_with_class_and_anonymous_function.php

changed

-        <token name="T_AMPERSAND_FOLLOWED_BY_VAR_OR_VARARG">&amp;</token>
+        <token name="T_AMPERSAND">&amp;</token>

with the 2.0 release.

T_AMPERSAND was a token type in PHP4.x and it only existed in theseer/tokenizer, because it was hard-coded in

since PHP5+ the builtin token names are
T_AMPERSAND_FOLLOWED_BY_VAR_OR_VARARG
and/or T_AMPERSAND_NOT_FOLLOWED_BY_VAR_OR_VARARG

https://3v4l.org/tU46U#veol

it looks like with 2.0.x we are now using T_AMPERSAND more often as we did with the 1.x counterpart.

I am not sure yet what todo about it, but wanted to leave it here so we can discuss the possible impact and/or a fix