Hi,
looks like parsing problem:
------------------------------------------------------------------
/* try1 */

#version 3.7;

global_settings {assumed_gamma 1}

box {0,1}

// #declare s_ = "a string to display"; // This works
#declare s_ = "----------------- DEBUG -----------------------------"; // This
not

#debug concat(s_, "\n")

#warning "end-of-file"
------------------------------------------------------------------
--
YB

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