No error when a mixin doesn't exist

[ericmorand]

• VS Code Version: Latest
• SCSS IntelliSense Version: 0.9.0
• Operating System: Windows 10

Reproducible Case:

Steps to Reproduce:

1. Create a SASS file with the following content:

.foo {
    @include foo();
}

2. Even with the error setting set to enable, no error or warning is thrown for that file even though foo mixin has not been imported.

[ericmorand]

I want to insist on the fact that this code does not compile with SASS. Trying to render it using node-sass for example throws the following error:

no mixin named foo.