c1d02bd147
Store the last token parsed in the parser state so that the range parsed can utilize its end rather than the start of the token after parsed. This results in a tighter range (especially true in the case of comments, see ```mlir |%c4 = arith.constant 4 : index // Foo | ``` vs ```mlir |%c4 = arith.constant 4 : index| ``` ). Discovered while working on a little textual post processing tool.