11134: internal: tighten up parser API r=matklad a=matklad
It's tempting to expose things like `Expr::parse`,
but they'll necessary have somewhat ad-hoc semantics.
Instead, we narrow down the parser's interface strictly
to what's needed for MBE. For everything else (eg, parsing
imports), the proper way is enclose the input string into
some context, parse the whole as a file, and then verify
that the input was parsed as intended.
bors r+
🤖
Co-authored-by: Aleksey Kladov <aleksey.kladov@gmail.com>
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