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 __stackmin          Minimum free runtime stack space
------------------------------------------------------------------------------
 Declaration
   system.hdr

 Syntax
   uint __stackmin

 Default
   65535.

 Description
   The __stackmin system variable contains the smallest amount
   of unused stack space during program execution. The value of __stackmin
   is set by the internal stack checking routine at the entry of each
   user-defined function call. The value of __stackmin is only meaningful
   if stack checking is not turned off by the -Gs compiler switch.

 Example
   #define EXAMPLE_SYSTEM
   #include example.hdr

   // This example demonstrates how recursion exhausts the stack
   
   vardef static
      ulong nCalls := 0
   enddef
   
   proc Test_stackmin
   nCalls++
   if __stackmin % 1000 < 10
      ? __stackmin, nCalls   // display minimum stack and recursion depth
   endif
   Test_stackmin()           // recursive call that ends in an error
   endproc

   proc main
   Test_stackmin()
   endproc