Revert "More diagnostic work."
Revert "More diagnostic work."

This reverts commit 2e6383015954f49ee4e1db1bb87e5096c1b81d69.

hippich/typescript,mbrowne/typescript-dci,mbrowne/typescript-dci,popravich/typescript,fdecampredon/jsx-typescript-old-version,popravich/typescript,mbrowne/typescript-dci,mbrowne/typescript-dci,fdecampredon/jsx-typescript-old-version,popravich/typescript,mbebenita/shumway.ts,hippich/typescript,mbebenita/shumway.ts,fdecampredon/jsx-typescript-old-version,hippich/typescript,mbebenita/shumway.ts