don’t display the missing stdlib dependency warning for the stdlib itself

Author: tayloraswift

Sources/UnidocUI/Endpoints/Docs/Unidoc.DocsEndpoint.PackagePage.swift

@@ -116,16 +116,21 @@ extension Unidoc.DocsEndpoint.PackagePage:Unidoc.ApicalPage
             } = "Repo details and more versions"
         }
 
-        //  Every package should have at least one dependency, the standard library.
-        main[.h2] = Heading.dependencies
-        main[.table]
+        //  Every package should have at least one dependency, the standard library, except for
+        //  the standard library itself.
+        if !self.volume.dependencies.isEmpty
         {
-            $0.class = "dependencies"
-        } = Unidoc.DependencyTable.init(
-            dependencies: self.volume.dependencies,
-            context: self.context)
+            main[.h2] = Heading.dependencies
+            main[.table]
+            {
+                $0.class = "dependencies"
+            } = Unidoc.DependencyTable.init(
+                dependencies: self.volume.dependencies,
+                context: self.context)
+        }
 
-        if !(self.volume.dependencies.contains { $0.exonym == .swift })
+        if  self.volume.symbol.package != .swift,
+            !(self.volume.dependencies.contains { $0.exonym == .swift })
         {
             main[.section, { $0.class = "signage deprecation" }]
             {