Joseph Ferano 6bc4726ddd C-x C-e expands, and a declaration is not an expression
Parse.expr never ran the expander, so a macro call typed as a bare
expression was an unknown name -- a package's and the prelude's alike,
which is what said the gap was older than importable macros. It is the
wrap Parse.decl already had, applied to the other entry point, with
Parse.with_imported in front of it in Session.eval_expr because the one
expression an editor sends carries no import.

The decision that was waiting: an expression that expands to a
declaration is refused by name, in the head dispatch rather than in a
walk over what the expander answered, so a nested one and a hand-typed
one get the same sentence. A quasiquoted declaration is still a value.

The spin refusal fires on this path; the ring cannot reach it, because a
ring is refused while its own package is parsed. Expansion happens
before the thunk is built, so the 5s three-way wait is untouched.
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