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      1  1.4  rillig # $NetBSD: varname-dollar.mk,v 1.4 2023/06/01 20:56:35 rillig Exp $
      2  1.1  rillig #
      3  1.2  rillig # Tests for the expression "$$", which looks as if it referred to a variable,
      4  1.2  rillig # but simply expands to a single '$' sign.
      5  1.3  rillig #
      6  1.3  rillig # If there really were a special variable named '$', the expressions ${${DOLLAR}}
      7  1.3  rillig # and $$ would always expand to the same value.
      8  1.3  rillig 
      9  1.3  rillig # Using the dollar sign in variable names is tricky and not recommended.
     10  1.3  rillig # To see that using this variable indeed affects the variable '$', run the
     11  1.3  rillig # test individually with the -dv option.
     12  1.3  rillig DOLLAR=		$$
     13  1.3  rillig 
     14  1.3  rillig # At this point, the variable '$' is not defined. Therefore the second line
     15  1.3  rillig # returns an empty string.
     16  1.4  rillig # expect+1: dollar is $.
     17  1.3  rillig .info dollar is $$.
     18  1.4  rillig # expect+1: dollar in braces is .
     19  1.3  rillig .info dollar in braces is ${${DOLLAR}}.
     20  1.3  rillig 
     21  1.3  rillig # Now overwrite the '$' variable to see whether '$$' really expands to that
     22  1.3  rillig # variable, or whether '$$' is handled by the parser.
     23  1.3  rillig ${DOLLAR}=	dollar
     24  1.1  rillig 
     25  1.3  rillig # At this point, the variable '$' is defined, therefore its value is printed
     26  1.3  rillig # in the second .info directive.
     27  1.4  rillig # expect+1: dollar is $.
     28  1.3  rillig .info dollar is $$.
     29  1.4  rillig # expect+1: dollar in braces is dollar.
     30  1.3  rillig .info dollar in braces is ${${DOLLAR}}.
     31  1.1  rillig 
     32  1.1  rillig all:
     33  1.1  rillig 	@:;
     34