Unhelpful error when passing arg to HTML element

[tomdale]

Passing an argument to a non-component produces an unhelpful error message.

Example

<h1 @count={{count}}>Hello</h1>

Playground Link

Expected behavior

A helpful error message, like

Cannot pass the '@count' argument to <h1>, because it is an HTML element, not a component. Arguments can only be passed to components.

Actual behavior

func is not a function

[givanse]

The exact same error message is logged if you use a custom helper in block form.

[locks]

Still happening.