BUG: passing a temp to a ref variable of the same name crashes the compiler

```

~temp i = 0
-> knot(i)

=== knot(ref i)
~i++

```

If you define the variable as a VAR there's a compilation error preventing the re-use of the name as a parameter, so this only happens with a temp.

The issue provides no file or test path; start by compiling the minimal Ink snippet that passes a temp to a same-named ref parameter and reproduce the compiler crash. Trace the failure around temp and parameter name handling. Done means the snippet compiles or reports a proper error without crashing, while the existing VAR name-reuse error remains intact.

Written by the indexing model from the issue text.