Added more tests

src/build/core/CompileCall.go

@@ -50,13 +50,3 @@ func (f *Function) CompileCall(root *expression.Expression) error {
 
 	return nil
 }
-
-// CompileSyscall executes a syscall.
-func (f *Function) CompileSyscall(expr *expression.Expression) error {
-	parameters := expr.Children[1:]
-	registers := f.cpu.Syscall[:len(parameters)]
-	err := f.ExpressionsToRegisters(parameters, registers)
-	f.assembler.Syscall()
-	f.sideEffects++
-	return err
-}

src/build/core/state.go

@@ -18,7 +18,6 @@ type state struct {
 	assembler   asm.Assembler
 	cpu         cpu.CPU
 	count       counter
-	sideEffects int
 }
 
 // counter stores how often a certain statement appeared so we can generate a unique label from it.