In the following code:

<pre>
<?php
class bar
{
public static function fc(string $a): string
{
return self::nested(
self::nested( //this line is marked as uncovered
$a
)
);
}
</pre>

Xdebug does not see an executable line on the commented line. VLD indicates this is the INIT_STATIC_METHOD_CALL opcode:

<pre>
line #* E I O op fetch ext return operands

4 0 E > EXT_NOP
1 RECV !0
6 2 EXT_STMT
3 INIT_STATIC_METHOD_CALL 'nested'
7 4 INIT_STATIC_METHOD_CALL 'nested'
8 5 SEND_VAR !0

</pre>