Improved instruction parser

src/build/Compile.go

@@ -6,7 +6,6 @@ import (
 
 // Compile compiles all the functions.
 func Compile(functions <-chan *Function, errors <-chan error) (map[string]*Function, error) {
-	wg := sync.WaitGroup{}
 	allFunctions := map[string]*Function{}
 
 	for functions != nil || errors != nil {
@@ -25,17 +24,28 @@ func Compile(functions <-chan *Function, errors <-chan error) (map[string]*Funct
 				continue
 			}
 
-			wg.Add(1)
-
-			go func() {
-				defer wg.Done()
-				function.Compile()
-			}()
-
 			allFunctions[function.Name] = function
 		}
 	}
 
+	wg := sync.WaitGroup{}
+
+	for _, function := range allFunctions {
+		wg.Add(1)
+
+		go func() {
+			defer wg.Done()
+			function.Compile()
+		}()
+	}
+
 	wg.Wait()
+
+	for _, function := range allFunctions {
+		if function.Error != nil {
+			return nil, function.Error
+		}
+	}
+
 	return allFunctions, nil
 }