Added system.program_results for controlling the exit code of the program under normal circumstances

Implemented operators like +=, -=, etc for ordinals, floats and string

Programs using the UnitTest module will now report the number of failed tests as the exit code of test runs (0 for successful run)

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/nimbase.h b/lib/nimbase.h
index cc0419f55..11278ccd2 100755
--- a/lib/nimbase.h
+++ b/lib/nimbase.h
@@ -331,6 +331,8 @@ typedef long long int NI64;
 typedef unsigned int NU32;
 #endif
 
+extern NI nim_program_result;
+
 typedef float NF32;
 typedef double NF64;
 typedef double NF;