🐞 `compile_var_dec()` advances properly
🐞 `compile_var_dec()` advances properly

It advanced one too many times; now it doesn't.

Also moved the `advance()` closer to the `emit()`; they
often go together.

cunnie/bin,cunnie/bin,cunnie/bin,cunnie/bin,cunnie/bin,cunnie/bin,cunnie/bin