Pass lit tests

Author: David Ungar

Sources/SwiftDriver/IncrementalCompilation/ModuleDependencyGraph.swift

@@ -130,8 +130,7 @@ extension ModuleDependencyGraph {
     precondition(dependencySource.typedFile.type == .swiftDeps)
     guard let sourceGraph = dependencySource.read(
             in: fileSystem,
-            reporter: reporter,
-            diagnosticEngine: diagnosticEngine)
+            reporter: reporter)
     else {
       return nil
     }
@@ -189,8 +188,7 @@ extension ModuleDependencyGraph {
                      dependencySource.typedFile)
     guard let sourceGraph = dependencySource.read(
             in: fileSystem,
-            reporter: reporter,
-            diagnosticEngine: diagnosticEngine)
+            reporter: reporter)
     else {
       return nil
     }

Sources/SwiftDriver/IncrementalCompilation/ModuleDependencyGraphParts/DependencySource.swift

@@ -62,8 +62,7 @@ extension DependencySource {
   /// Returns nil if no dependency info there.
   public func read(
     in fileSystem: FileSystem,
-    reporter: IncrementalCompilationState.Reporter?,
-    diagnosticEngine: DiagnosticsEngine
+    reporter: IncrementalCompilationState.Reporter?
   ) -> SourceFileDependencyGraph? {
     let graphIfPresent: SourceFileDependencyGraph?
     do {
@@ -73,7 +72,6 @@ extension DependencySource {
     }
     catch {
       let msg = "Could not read \(file) \(error.localizedDescription)"
-      diagnosticEngine.emit(warning: msg)
       reporter?.report(msg, typedFile)
       return nil
     }

Tests/SwiftDriverTests/ModuleDependencyGraphTests.swift

@@ -1103,10 +1103,10 @@ fileprivate struct SourceFileDependencyGraphMocker {
   private mutating func findExistingNodeOrCreateIfNew(_ key: DependencyKey, _ fingerprint: String?,
                                                       isProvides: Bool) -> Node {
     func createNew() -> Node {
-      let n = Node(key: key, fingerprint: fingerprint,
-                   sequenceNumber: allNodes.count,
-                   defsIDependUpon: [],
-                   isProvides: isProvides)
+      let n = try! Node(key: key, fingerprint: fingerprint,
+                        sequenceNumber: allNodes.count,
+                        defsIDependUpon: [],
+                        isProvides: isProvides)
       allNodes.append(n)
       memoizedNodes[key] = n
       return n