1. Assumptions:
	A1. Fixed form: No WS between characters/digits in identifiers, keywords and constants.
	A2. If col:5 is not blank (WS), col:6 should be blank.
	A3. Line continuation should not break any identifier, keyword or constants.
	A4. No comment appears in a continued statement
	
2. Incomplete rules:
	R507: 
 *        R1510 generic stmt
	R514: 
 *        R1111 change team construct
 *        R1148 select rank construct
 	R726:  derived type def
 *	      Sub-rules are not completed and tested.
    R901: 'RE', 'IM' for complex number fields
    R926: 'STAT', 'TEAM' and 'TEAM_NUMBER' for image selector spec
    R928: 'ERRMSG', 'MOLD', 'SOURCE', 'STAT'
    R931: One branch unfinished.
    R936: unfinished.
 
3. Deprecated rules:
	R605-08:
 *		 default_logical_variable 
 *		 scalar_default_logical_variable 
	R607-08:
 *		 default_char_variable 
 *		 scalar_default_char_variable 
 
 ---- ---- ---- ---- ---- ---- ---- ---- ---- ----

 // R605
default_logical_variable
	:	variable
            { action.default_logical_variable(); }
	;

scalar_default_logical_variable
	:	variable
            { action.scalar_default_logical_variable(); }
	;


// R607

scalar_default_char_variable
	:	variable
            { action.scalar_default_char_variable(); }
	;
 
 ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
 
 TODO: Clean up all Token declarations
 
 
 TODO: 
 	1). Revert the PreprocessorTokenSource and let the PP2Fortran converter to handle the PPNUMBER token
 	    (Involved case: '4x4' in a comment line like '! a 4x4 matrix')
 	2). Check the conversion for '..' as T_DOT_DOT and 'CONTIGUOUS' for T_CONTIGUOUS
 	
 Ant for new grammar file:
 
 
	<target name="nfp" depends="fParserDependencies" unless="FortranParser08UpToDate">
		<java classname="org.antlr.Tool" classpathref="antlr.class.path" fork="true" failonerror="true" dir="${fortran.grammar.dir}">
			<arg value="-verbose" />
			<arg value="FortranParser2018.g" />
		</java>
	</target>