1) deprecated inside comment before import or package deprecates the construct below it.
/** @deprecated **/
import test;
class T{}

class T will be deprecated mistakingly.

2) for this input,
@SuppressWarnings("fallthrough") class Parser {}
the position of JCModifiers is set to the position of 'class'.
it should be the position of the '@' sign.

3) <Integer>super(x)
for this input, indentifer super's position is set to the position of '<', shouldn't be like this.

4) There are several places where code are like
F.at(pos).Wildcard(t, type());
which will generate tree node with wrong position.

5) com.sun.tools.javac.parser.Parser.typeArguments() is wrong for <a extends C<b>>
end position is not right for c<b>, it's set to the position of b, but should set to the last '>' of 'C<b>'

6)the positions of complex binary position isn't right, for expression like
c == 0 && e == 0 && f == 0
the postion of the 'e == 0 && f == 0' part is set to the position of the last '==', but should be '&&'.

7) string isn't folded all the time. maybe not a bug.
String s = "a"+"b" is folded by parser to s = "ab", but if(s!= "a"+"b") is not foled.