SI-7848 Xlint says what looks interpolated

The motivating use case was an Expecty debug string
getting flagged for `$eq`.

The test case demonstrates a different bug, in which
the position of the literal tree is changed when typer
gets rid of the unused local, so that when the tree is
re-typed in erasure, a second, spurious warning is
emitted at the start of the method. Specifically, the
second warning is not suppressed because of the
different position.
SI-7855 No missing interpolator warning post-typer

Avoid extra work, extra warnings.
SI-7848 Xlint no warn on $sym with params

This idea brought to you by retronym.
Merge pull request #2956 from som-snytt/issue/7848-forgotten-interp-msg

SI-7848 Xlint says what looks interpolated