try / handle / finally

Handle checked Java exceptions and run final cleanup.

Example.kalm kalm

use java.nio.file.Files
use java.nio.file.Path

pub fun readFile(path: Path) -> Text:
    try:
        return Files.readString(path)
    handle (error: java.io.IOException):
        return "Could not read file"
    finally:
        sayLine("read attempted")

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