Add `<meta charset="utf-8">` to `-Zdump-mir-spanview` output Without an explicit `<meta charset>` declaration, some browsers (e.g. Safari) won't detect the page encoding as UTF-8, causing unicode characters in the dump output to display incorrectly.
unused_must_use
SyntaxContext::is_root
#[lang_item]
core::ptr::Unique
AliasKind::Weak