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/* No escape */
#define MESSAGE1 "${var1}"
/* Single escape means no replace */
#define MESSAGE2 "\${var1}"
/* Replace pairs of escapes before '@' or '\@' with escape characters
* (note we have to double number of pairs due to C string escaping)
*/
#define MESSAGE3 "\\\\${var1}"
/* Pairs of escapes and then single escape to avoid replace */
#define MESSAGE4 "\\\\\${var1}"
/* Check escape character outside variables */
#define MESSAGE5 "\\ ${ \${ \\\\${ \\\\\${"
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