"Not found" could be more descriptive

## Compiler version

3.7

## Minimized example

```Scala
def test[T] = println(T)
```

## Output

```
1 |def test[T] = println(T)
  |                      ^
  |                      Not found: T
  |
```

## Expectation

It would be helpful if the compiler said "I found a type `T` but I am looking for a term here", or something like that.

