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Issue created by Administrator@rootContributor

IllegalStateException during action graph creation

Created by: kageiit

Seeing this on latest buck master

java.lang.IllegalStateException: Multiple rules created for target '//foo:test_main':
new rule '//foo:test_main' does not match existing rule '//foo:test_main'.
	at com.google.common.base.Preconditions.checkState(Preconditions.java:738)
	at com.facebook.buck.rules.SingleThreadedBuildRuleResolver.computeIfAbsent(SingleThreadedBuildRuleResolver.java:92)
	at com.facebook.buck.rules.SingleThreadedBuildRuleResolver.requireRule(SingleThreadedBuildRuleResolver.java:107)
	at com.facebook.buck.rules.ActionGraphCache$2.visit(ActionGraphCache.java:315)
	at com.facebook.buck.rules.ActionGraphCache$2.visit(ActionGraphCache.java:1)
	at com.facebook.buck.graph.AbstractBottomUpTraversal.traverse(AbstractBottomUpTraversal.java:36)
	at com.facebook.buck.rules.ActionGraphCache.createActionGraphSerially(ActionGraphCache.java:317)
	at com.facebook.buck.rules.ActionGraphCache.createActionGraph(ActionGraphCache.java:250)
	at com.facebook.buck.rules.ActionGraphCache.getActionGraph(ActionGraphCache.java:151)
	at com.facebook.buck.rules.ActionGraphCache.getActionGraph(ActionGraphCache.java:74)
	at com.facebook.buck.cli.BuildCommand.createActionGraphAndResolver(BuildCommand.java:920)
	at com.facebook.buck.cli.BuildCommand.createGraphs(BuildCommand.java:453)
	at com.facebook.buck.cli.BuildCommand.executeBuildAndProcessResult(BuildCommand.java:521)
	at com.facebook.buck.cli.BuildCommand.run(BuildCommand.java:412)
	at com.facebook.buck.cli.BuildCommand.runWithoutHelp(BuildCommand.java:379)
	at com.facebook.buck.cli.AbstractCommand.run(AbstractCommand.java:232)
	at com.facebook.buck.cli.AbstractContainerCommand.run(AbstractContainerCommand.java:80)
	at com.facebook.buck.cli.BuckCommand.run(BuckCommand.java:79)
	at com.facebook.buck.cli.Main.runMainWithExitCode(Main.java:1065)
	at com.facebook.buck.cli.Main.runMainThenExit(Main.java:386)
	at com.facebook.buck.cli.Main.main(Main.java:1626)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.facebook.buck.cli.bootstrapper.ClassLoaderBootstrapper.main(ClassLoaderBootstrapper.java:55)

cc @yiding

Action graph parallelization is turned off