8307444: java.lang.AssertionError when using unnamed patterns
8307482: Compiler should accept var _ in nested patterns in switch case
8307007: Implementation for javax.lang.model for unnamed variables (Preview)
8308312: Compiler should fail when a local variable declaration does not include an Identifier and does not have an initializer
8308309: Compiler should accept mixed masked and unmasked variables in lambda parameters
Co-authored-by: Jan Lahoda <jlahoda@openjdk.org>
Co-authored-by: Aggelos Biboudis <abimpoudis@openjdk.org>
Reviewed-by: vromero, darcy
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