Linter fails to catch undefined objects and attributes in the code

[yegor256]

This is my code:

[n] > app
  QQ.io.stdout > @
    QQ.txt.sprintf *1
      "Hello, %s!"
      foo

Here, foo is not defined in the app object and there is no @ attribute in app. Obviously, it's a wrong reference to an object. Lints can catch this, but currently they don't. I'm getting this, in runtime:

Couldn't find object 'Φ.org.eolang.foo' because there's no class or package 'EOorg.EOeolang.EOfoo'

Let's create a lint for this.