add extended info for E0436 functional record update syntax needs struct

This example focuses on struct-like enum variants, because it's not
immediately obvious in what other context we can get E0436 alone,
without any other, more serious, errors. (Triggering E0436 with a union
also emits a separate "union expressions should have exactly one field"
error.)

(One might argue that we ought to accept the functional record update
syntax for struct-like enums, but that is beyond the scope of this
error-index-comprehensiveness commit.)

0 files changed, 0 insertions, 0 deletions