[jdk16] RFR: 8258972: unexpected compilation error with generic sealed interface [v3]

[Vicente Romero]

> Hi,
> 
> Please review this fix to the implementation of section `5.1.6.1 Allowed Narrowing Reference Conversion` of the Sealed Classes spec [1](http://cr.openjdk.java.net/~gbierman/jep397/jep397-20201204/specs/sealed-classes-jls.html#jls-5.1.6.1). IMO the compiler was not implementing the spec to the letter in particular the inheritance relation between a sealed class and a subclass should be tested ignoring type arguments which is what this patch is doing. Comments?
> 
> Thanks,
> Vicente

Vicente Romero has updated the pull request incrementally with one additional commit since the last revision:

  adding missing calls to Types::erasure

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk16/pull/72/files
  - new: https://git.openjdk.java.net/jdk16/pull/72/files/36017f21..60c60bd9

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk16&pr=72&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk16&pr=72&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk16/pull/72.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk16 pull/72/head:pull/72

PR: https://git.openjdk.java.net/jdk16/pull/72