Variable not recognized inside `if` statement when declared as a block parameter about alma

[masak]

I was sure we had a test for this. And we do, in corner-cases.t.

{
    my $program = q:to/./;
        if "James" -> s {
            say(s);
        }
        .

    my $ast = q:to/./;
        (statements
          (if (str "James") (block (parameters (ident "s")) (statements
            (stexpr (call (ident "say") (arguments (ident "s"))))))))
        .

    parses-to $program, $ast, "if statement with a pointy block";
}

But the test only makes sure we compile to the right AST. Something must be going wrong after that. Perhaps in the way Q::Statement::If handles its parameter declaration?