Added lastPop field to VM

src/backend/vm.nim

@@ -30,6 +30,7 @@ type
         chunk: Chunk                # Piece of bytecode to execute
         frames: seq[int]            # Stores the initial index of stack frames
         heapVars: seq[PeonObject]   # Stores variables that do not have stack semantics (i.e. "static")
+        lastPop*: PeonObject         # Used in the REPL
 
 
 proc initCache*(self: PeonVM) =
@@ -265,7 +266,7 @@ proc dispatch*(self: PeonVM) =
             of NoOp:
                 continue
             of Pop:
-                discard self.pop()
+                self.lastPop = self.pop()
             of PopN:
                 for _ in 0..<int(self.readLong()):
                     discard self.pop()

src/config.nim

@@ -27,7 +27,7 @@ when len(PEON_COMMIT_HASH) != 40:
 const PEON_BRANCH* = "master"
 when len(PEON_BRANCH) > 255:
     {.fatal: "The git branch name's length must be less than or equal to 255 characters".}
-const DEBUG_TRACE_VM* = true # Traces VM execution
+const DEBUG_TRACE_VM* = false # Traces VM execution
 const DEBUG_TRACE_GC* = false # Traces the garbage collector (TODO)
 const DEBUG_TRACE_ALLOCATION* = false # Traces memory allocation/deallocation
 const DEBUG_TRACE_COMPILER* = false # Traces the compiler

src/main.nim

@@ -123,6 +123,7 @@ proc repl =
             when debugRuntime:
                 styledEcho fgCyan, "\n\nExecution step: "
             vm.run(serialized.chunk)
+            echo vm.lastPop
         except LexingError:
             let exc = LexingError(getCurrentException())
             let relPos = tokenizer.getRelPos(exc.line)