Update diagnostics for duplicated product/target names

Sources/PackageGraph/ModulesGraph.swift

@@ -350,8 +350,7 @@ extension PackageGraphError: CustomStringConvertible {
                 }
                 return description
             }
-
-            return "multiple products named '\(product)' in: \(packagesDescriptions.joined(separator: ", "))"
+            return "multiple packages (\(packagesDescriptions.joined(separator: ", "))) declare products with a conflicting name: '\(product)’; product names need to be unique across the package graph"
         case .multipleModuleAliases(let target, let product, let package, let aliases):
             return "multiple aliases: ['\(aliases.joined(separator: "', '"))'] found for target '\(target)' in product '\(product)' from package '\(package)'"
         case .unsupportedPluginDependency(let targetName, let dependencyName, let dependencyType,  let dependencyPackage):

Sources/PackageLoading/PackageBuilder.swift

@@ -98,7 +98,7 @@ extension ModuleError: CustomStringConvertible {
         switch self {
         case .duplicateModule(let target, let packages):
             let packages = packages.map(\.description).sorted().joined(separator: "', '")
-            return "multiple targets named '\(target)' in: '\(packages)'"
+            return "multiple packages ('\(packages)') declare targets with a conflicting name: '\(target)’; target names need to be unique across the package graph"
         case .moduleNotFound(let target, let type, let shouldSuggestRelaxedSourceDir):
             let folderName = (type == .test) ? "Tests" : (type == .plugin) ? "Plugins" : "Sources"
             var clauses = ["Source files for target \(target) should be located under '\(folderName)/\(target)'"]

Tests/BuildTests/BuildPlanTests.swift

@@ -130,7 +130,7 @@ final class BuildPlanTests: XCTestCase {
         )) { error in
             XCTAssertEqual(
                 (error as? PackageGraphError)?.description,
-                "multiple products named 'Logging' in: 'barpkg' (at '\(barPkg)'), 'foopkg' (at '\(fooPkg)')"
+                "multiple packages (\'barpkg\' (at '\(barPkg)'), \'foopkg\' (at '\(fooPkg)')) declare products with a conflicting name: \'Logging’; product names need to be unique across the package graph"
             )
         }
     }
@@ -552,7 +552,7 @@ final class BuildPlanTests: XCTestCase {
         )) { error in
             XCTAssertEqual(
                 (error as? PackageGraphError)?.description,
-                "multiple products named 'Logging' in: 'barpkg' (at '\(barPkg)'), 'foopkg' (at '\(fooPkg)')"
+                "multiple packages (\'barpkg\' (at '\(barPkg)'), \'foopkg\' (at '\(fooPkg)')) declare products with a conflicting name: \'Logging’; product names need to be unique across the package graph"
             )
         }
     }

Tests/BuildTests/ModuleAliasingBuildTests.swift

@@ -265,7 +265,7 @@ final class ModuleAliasingBuildTests: XCTestCase {
             ],
             observabilityScope: observability.topScope
         )) { error in
-            XCTAssertEqual((error as? PackageGraphError)?.description, "multiple products named 'Logging' in: 'barpkg' (at '\(barPkg)'), 'foopkg' (at '\(fooPkg)')")
+            XCTAssertEqual((error as? PackageGraphError)?.description, "multiple packages (\'barpkg\' (at '\(barPkg)'), \'foopkg\' (at '\(fooPkg)')) declare products with a conflicting name: \'Logging’; product names need to be unique across the package graph")
         }
     }
 
@@ -327,7 +327,7 @@ final class ModuleAliasingBuildTests: XCTestCase {
             ],
             observabilityScope: observability.topScope
         )) { error in
-            XCTAssertEqual((error as? PackageGraphError)?.description, "multiple products named 'Logging' in: 'barpkg' (at '\(barPkg)'), 'foopkg' (at '\(fooPkg)')")
+            XCTAssertEqual((error as? PackageGraphError)?.description, "multiple packages (\'barpkg\' (at '\(barPkg)'), \'foopkg\' (at '\(fooPkg)')) declare products with a conflicting name: \'Logging’; product names need to be unique across the package graph")
         }
     }
 
@@ -4697,7 +4697,7 @@ final class ModuleAliasingBuildTests: XCTestCase {
 
             XCTFail("unexpectedly resolved the package graph successfully")
         } catch {
-            XCTAssertEqual(error.interpolationDescription, "multiple products named 'SomeProduct' in: 'other' (at '\(AbsolutePath("/Other"))'), 'some' (at '\(AbsolutePath("/Some"))')")
+            XCTAssertEqual(error.interpolationDescription, "multiple packages ('other' (at '\(AbsolutePath("/Other"))'), 'some' (at '\(AbsolutePath("/Some"))')) declare products with a conflicting name: 'SomeProduct’; product names need to be unique across the package graph")
         }
         XCTAssertEqual(observability.diagnostics.map { $0.description }.sorted(), ["[warning]: product aliasing requires tools-version 5.2 or later, so it is not supported by \'other\'", "[warning]: product aliasing requires tools-version 5.2 or later, so it is not supported by \'some\'"])
     }

Tests/PackageGraphTests/ModulesGraphTests.swift

@@ -384,7 +384,7 @@ final class ModulesGraphTests: XCTestCase {
         )
 
         testDiagnostics(observability.diagnostics) { result in
-            result.check(diagnostic: "multiple targets named 'Bar' in: 'bar', 'foo'", severity: .error)
+            result.check(diagnostic: "multiple packages ('bar', 'foo') declare targets with a conflicting name: 'Bar’; target names need to be unique across the package graph", severity: .error)
         }
     }
 
@@ -443,7 +443,7 @@ final class ModulesGraphTests: XCTestCase {
         )
 
         testDiagnostics(observability.diagnostics) { result in
-            result.check(diagnostic: "multiple targets named 'First' in: 'first', 'fourth', 'second', 'third'", severity: .error)
+            result.check(diagnostic: "multiple packages ('first', 'fourth', 'second', 'third') declare targets with a conflicting name: 'First’; target names need to be unique across the package graph", severity: .error)
         }
     }
 
@@ -513,8 +513,8 @@ final class ModulesGraphTests: XCTestCase {
         )
 
         testDiagnostics(observability.diagnostics) { result in
-            result.checkUnordered(diagnostic: "multiple targets named 'Bar' in: 'fourth', 'third'", severity: .error)
-            result.checkUnordered(diagnostic: "multiple targets named 'Foo' in: 'first', 'second'", severity: .error)
+            result.checkUnordered(diagnostic: "multiple packages ('fourth', 'third') declare targets with a conflicting name: 'Bar’; target names need to be unique across the package graph", severity: .error)
+            result.checkUnordered(diagnostic: "multiple packages ('first', 'second') declare targets with a conflicting name: 'Foo’; target names need to be unique across the package graph", severity: .error)
         }
     }
 
@@ -582,7 +582,7 @@ final class ModulesGraphTests: XCTestCase {
         )
 
         testDiagnostics(observability.diagnostics) { result in
-            result.check(diagnostic: "multiple targets named 'First' in: 'first', 'fourth'", severity: .error)
+            result.check(diagnostic: "multiple packages ('first', 'fourth') declare targets with a conflicting name: 'First’; target names need to be unique across the package graph", severity: .error)
         }
     }
 
@@ -1302,7 +1302,7 @@ final class ModulesGraphTests: XCTestCase {
         )
 
         testDiagnostics(observability.diagnostics) { result in
-            result.check(diagnostic: "multiple targets named 'Foo' in: 'dep2', 'start'", severity: .error)
+            result.check(diagnostic: "multiple packages ('dep2', 'start') declare targets with a conflicting name: 'Foo’; target names need to be unique across the package graph", severity: .error)
         }
     }
 
@@ -1351,8 +1351,7 @@ final class ModulesGraphTests: XCTestCase {
             ],
             observabilityScope: observability.topScope
         )) { error in
-            XCTAssertEqual((error as? PackageGraphError)?.description,
-                           "multiple products named 'Bar' in: 'bar' (at '\(barPkg)'), 'baz' (at '\(bazPkg)')")
+            XCTAssertEqual((error as? PackageGraphError)?.description, "multiple packages (\'bar\' (at '\(barPkg)'), \'baz\' (at '\(bazPkg)')) declare products with a conflicting name: \'Bar’; product names need to be unique across the package graph")
         }
     }