invalid css in render function doesn't show error

[trafnar]

extension v3.0.8
imba v2.0.0-alpha.175

If you mistakenly use a root-level css declaration within render, but outside self, there is an error in the terminal but not in the tooling. This is an easy mistake to make, and can be confusing to debug.

def render
    # this root-level css is not allowed oustide self within render, it produces an error
    # but the error is not shown in the tooling, making it hard to catch/understand/debug
    css bgc:red

    # this is allowed and works
    css .foo bgc:red

    <self>
    ...