Rollup merge of #151280 - chenyukang:yukang-fix-149787, r=estebank

Fix incorrect trailing comma suggested in no_accessible_fields

Fixes rust-lang/rust#149787

r? @estebank

I think add new field for AST for it is too heavy change for this issue, here is a trivial fix with source_map, seems enough for it.

Author: JonathanBrouwer