You cannot use "classic" DevMode with a Java 7 JVM and -sourceLevel 8, and that includes GWTTestCases (unless run in prod mode); so forcing sourceLevel 8 would mean requiring Java 8, and because of issues with using a Java 8 JDK while targeting a Java 7 runtime JVM, this is not something we can do today (most build tools, moreover, have rather bad support for multiple "toolchains" in the same build, which would require builds to be split in several "steps" each invoked with its own JVM)
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