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Issue Description:

On recent toolchain, this code compiles:

func f() {
print(["hello","world"].map(.count))
}

But if you put just the print statement in a file and compile it, you get a compiler assertion:

Assertion failed: (->isLocalContext() && "not a global variable)"), function isLazilyInitializedGlobal, file /Users/buildnode/jenkins/workspace/oss-swift-package-osx/swift/lib/AST/Decl.cpp, line 5145.