Suppress completion in non-user code

src/LanguageServer/Impl/Completion/CompletionSource.cs

@@ -16,7 +16,7 @@
 using System.Linq;
 using Microsoft.Python.Analysis;
 using Microsoft.Python.Analysis.Analyzer.Expressions;
-using Microsoft.Python.Core;
+using Microsoft.Python.Analysis.Modules;
 using Microsoft.Python.Core.Text;
 using Microsoft.Python.Parsing;
 using Microsoft.Python.Parsing.Ast;
@@ -30,6 +30,10 @@ public CompletionSource(IDocumentationSource docSource, ServerSettings.PythonCom
         }
 
         public CompletionResult GetCompletions(IDocumentAnalysis analysis, SourceLocation location) {
+            if(analysis.Document.ModuleType != ModuleType.User) {
+                return CompletionResult.Empty;
+            }
+
             var context = new CompletionContext(analysis, location, _itemSource);
 
             ExpressionLocator.FindExpression(analysis.Ast, location,

src/LanguageServer/Impl/Completion/ErrorExpressionCompletion.cs

@@ -43,6 +43,10 @@ public static CompletionResult GetCompletions(ScopeStatement scope, Node stateme
             Expression e;
 
             var lastToken = tokens.FirstOrDefault();
+            if(lastToken.Value == null) {
+                return CompletionResult.Empty;
+            }
+
             var nextLast = tokens.ElementAtOrDefault(1).Value?.Kind ?? TokenKind.EndOfFile;
             switch (lastToken.Value.Kind) {
                 case TokenKind.Dot:

src/LanguageServer/Impl/Completion/ExpressionLocator.cs

@@ -42,6 +42,7 @@ public static void FindExpression(PythonAst ast, SourceLocation position, FindEx
             }
 
             expression = expression ?? (statement as ExpressionStatement)?.Expression;
+            scope = scope ?? ast;
         }
 
         private static bool CanBackUp(PythonAst ast, Node node, Node statement, ScopeStatement scope, int column) {