-------------------------------------
/* 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")

#error "No objects in scene"
// #warning "end-of-file"
-------------------------------------
Gives:
"C:\temp\povtest\try1.pov" line 14: Parse Error: Parse halted by #error
directive: No objects in scene

without console output, but with debug print in try1.txt (attached).

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