allow method calls on integers to start with a _
          #294
        
          
      
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this basically allows for
42._method()to properly parse as the call of the method_methodon the integer42.the FLOAT_LITERAL reference explicitly states
not immediately followed by ., _ or an XID_Start characterfor the character after an ending dot, so disallow this here too.this fixes exactly one rustc test: integer-literal-method-call-underscore.rs, the test that was for exactly this behaviour.
(noticed this while working on #293)