fix duplicate type parameters to still have a symbol bound
fix duplicate type parameters to still have a symbol bound

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