Issue #2388: Fixed translation of Java 16+ pattern matching in instanceof expressions within if statements.
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…nceof` expressions within `if` statements. This change introduces a `needsCastChk` flag to `CastExpression` to prevent redundant runtime cast checks. When translating `if (expr instanceof Type var)`, a local variable `var` is declared and initialized with a cast of `expr`. Since the `instanceof` check already guarantees type safety, the generated cast does not need an additional runtime check. For complex conditions like `if (expr instanceof Type var && otherCondition)`, the translation now creates a nested `if` statement for `otherCondition` inside the block where `var` is in scope. PiperOrigin-RevId: 813986197
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Issue #2388: Fixed translation of Java 16+ pattern matching in
instanceofexpressions withinifstatements.This change introduces a
needsCastChkflag toCastExpressionto prevent redundant runtime cast checks. When translatingif (expr instanceof Type var), a local variablevaris declared and initialized with a cast ofexpr. Since theinstanceofcheck already guarantees type safety, the generated cast does not need an additional runtime check. For complex conditions likeif (expr instanceof Type var && otherCondition), the translation now creates a nestedifstatement forotherConditioninside the block wherevaris in scope.