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GCJ now generate type assertions when compiling from bytecode, but not when
compiling from source code.
The source front-end needs to be updated to call add_type_assertion() when
implicit type conversions occur.
All gcj front end bugs have been fixed by the gcj-eclipse branch merge.
I'm mass-closing the affected PRs.
If you believe one of these was closed in error, please reopen it
with a note explaining why.