You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: syntax_test.go
    path of file: ./repos/ebiten/internal/shader
    
    the code of the file until where you have to start completion: // Copyright 2022 The Ebiten Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
//
    
func foo(x vec2) {
	Foo += 0
}`)); err == nil {
		t.Error("compileToIR must return an error but did not")
	}

	// Issue #2711
	if _, err := compileToIR([]byte(`package main

var Foo float = 1
`)); err == nil {
		t.Error("compileToIR must return an error but did not")
	}
	if _, err := compileToIR([]byte(`package main

var Foo, Bar int = 1, 1
`)); err == nil {
		t.Error("compileToIR must return an error but did not")
	}
}