Rollup merge of #99030 - rust-lang:notriddle/field-recovery, r=petrochenkov

diagnostics: error messages when struct literals fail to parse

If an expression is supplied where a field is expected, the parser can become convinced that it's a shorthand field syntax when it's not.

This PR addresses it by explicitly recording the permitted `:` token immediately after the identifier, and also adds a suggestion to insert the name of the field if it looks like a complex expression.

Fixes #98917

diff --cc compiler/rustc_parse/src/parser/expr.rs
Simple merge