Use a consistent definition for unreachable code in macro expansions.#1166
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This PR defines a single `ExprSyntax` instance we can use for unreachable code paths in macro expansions (where the compiler/swift-syntax requires us to produce an expression but we know we're going to emit an error anyway.)
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This PR defines a single
ExprSyntaxinstance we can use for unreachable code paths in macro expansions (where the compiler/swift-syntax requires us to produce an expression but we know we're going to emit an error anyway.)Checklist: