Added comment about SENSE LIGHT statement from earliest Fortran.

Author: rasmussn

fortran/syntax/FortranObsolete.sdf

@@ -41,3 +41,14 @@ context-free syntax
 
   AssignStmt                                    -> ActionStmt
   OptLabel 'ASSIGN' Label 'TO' IntVariable  EOS -> AssignStmt   {cons("AssignStmt")}
+
+%% SENSE LIGHT STATEMENT
+%%
+%% First IBM Fortran version had 32 statements
+%%  - one was the SENSE LIGHT "statement"
+%%     http://computer-programming-forum.com/49-fortran/868f0c3d821b8563.htm
+%%
+%% IF (SENSE LIGHT i) n1, n2
+%%
+%% - looks like an expression to me
+%%