LSP doesn't hide @private/@local/@test functions + leaks function arguments in suggestions

[alexveden]

Describe the bug

1. add_priv / add_local - appear in suggestions
2. a / b2 are the function arguments and shouldn't be displayed
3. test_add2 is a @test method I think there is no value to suggest it
4. sub() is not shown because of doc string before it, when I remove it works

Minimal code

module foo;
import std::os;


fn int add(int a, int b2){
    assert(b2 != 7);
    return a + b2;
}

fn int add_priv(int a, int bbb) @private{
    return a + bbb;
}

fn int add_local(int a, int ccc) @local{
    return a + ccc;
}

fn void test_add2() @test {
    add(34, 4);
    assert(17 == add(2,3));
}

<*
This is doc, preventing
*>
fn int sub(int a, int b){
    return a - b;
}

Expected
foo:: suggestions list should contain only add and sub functions.

p.s. sub issue with docstring may also be related to #91

[pherrymason]

Good suggestions, will review them