Handle enhanced #line directive in DirectiveTriviaSyntax.DirectiveNameToken

src/Compilers/CSharp/Portable/Syntax/DirectiveTriviaSyntax.cs

@@ -44,6 +44,8 @@ public SyntaxToken DirectiveNameToken
                         return ((UndefDirectiveTriviaSyntax)this).UndefKeyword;
                     case SyntaxKind.LineDirectiveTrivia:
                         return ((LineDirectiveTriviaSyntax)this).LineKeyword;
+                    case SyntaxKind.LineSpanDirectiveTrivia:
+                        return ((LineSpanDirectiveTriviaSyntax)this).LineKeyword;
                     case SyntaxKind.PragmaWarningDirectiveTrivia:
                         return ((PragmaWarningDirectiveTriviaSyntax)this).PragmaKeyword;
                     case SyntaxKind.PragmaChecksumDirectiveTrivia:

src/Compilers/CSharp/Test/Syntax/Diagnostics/LineSpanDirectiveTests.cs

@@ -463,6 +463,11 @@ private static ImmutableArray<SyntaxNode> GetStatementsAndExpressionBodies(Synta
 
         private static ImmutableArray<string> GetLineMappings(SyntaxTree tree)
         {
+            var directives = tree.GetRoot().DescendantNodesAndSelf(descendIntoTrivia: true).OfType<DirectiveTriviaSyntax>();
+            foreach (var directive in directives)
+            {
+                Assert.NotEqual(SyntaxKind.None, directive.DirectiveNameToken.Kind());
+            }
             return tree.GetLineMappings().Select(mapping => mapping.ToString()!).ToImmutableArray();
         }
 
@@ -545,15 +550,18 @@ static void Main()
         B();
 #line (1, 1) - (1, 100) ""b.txt""
         C();
+#line (2, 3) - (2, 4) 9 ""a.txt""
+        D();
     }
     static void A() { }
     static void B() { }
     static void C() { }
+    static void D() { }
 }".NormalizeLineEndings();
             var verifier = CompileAndVerify(source, options: TestOptions.DebugDll);
             verifier.VerifyIL("Program.Main", sequencePoints: "Program.Main", expectedIL:
 @"{
-  // Code size       20 (0x14)
+  // Code size       26 (0x1a)
   .maxstack  0
  -IL_0000:  nop
  -IL_0001:  call       ""void Program.A()""
@@ -562,7 +570,9 @@ .maxstack  0
   IL_000c:  nop
  -IL_000d:  call       ""void Program.C()""
   IL_0012:  nop
- -IL_0013:  ret
+ -IL_0013:  call       ""void Program.D()""
+  IL_0018:  nop
+ -IL_0019:  ret
 }");
             verifier.VerifyPdb("Program.Main", expectedPdb:
 @"<symbols>
@@ -583,11 +593,13 @@ .maxstack  0
         <entry offset=""0x1"" startLine=""3"" startColumn=""4"" endLine=""3"" endColumn=""8"" document=""2"" />
         <entry offset=""0x7"" startLine=""8"" startColumn=""9"" endLine=""8"" endColumn=""13"" document=""1"" />
         <entry offset=""0xd"" startLine=""1"" startColumn=""9"" endLine=""1"" endColumn=""13"" document=""3"" />
-        <entry offset=""0x13"" startLine=""2"" startColumn=""5"" endLine=""2"" endColumn=""6"" document=""3"" />
+        <entry offset=""0x13"" startLine=""2"" startColumn=""3"" endLine=""2"" endColumn=""5"" document=""2"" />
+        <entry offset=""0x19"" startLine=""3"" startColumn=""5"" endLine=""3"" endColumn=""6"" document=""2"" />
       </sequencePoints>
     </method>
   </methods>
-</symbols>");
+</symbols>
+");
         }
     }
 }

src/Compilers/CSharp/Test/Syntax/Parsing/LineSpanDirectiveParsingTests.cs

@@ -1480,7 +1480,7 @@ public void UnexpectedToken_09()
         }
 
         [Fact]
-        public void UnexpectedToken_11()
+        public void UnexpectedToken_10()
         {
             string source = @"#line (1, 2) - (3, 4) file.cs";
 

src/EditorFeatures/CSharpTest/Completion/CompletionProviders/SnippetCompletionProviderTests.cs

@@ -78,6 +78,10 @@ public async Task SnippetsNotInPreProcessorContextDirectiveNameAlreadyTyped()
         public async Task ShowRegionSnippetWithHashRTyped()
             => await VerifyItemExistsAsync(@"#r$$", MockSnippetInfoService.PreProcessorSnippetShortcut.Substring(1), sourceCodeKind: SourceCodeKind.Regular);
 
+        [Fact, Trait(Traits.Feature, Traits.Features.Completion)]
+        public async Task SnippetsInLineSpanDirective()
+            => await VerifyItemIsAbsentAsync(@"#line (1, 2) - (3, 4) $$", MockSnippetInfoService.PreProcessorSnippetShortcut, sourceCodeKind: SourceCodeKind.Regular);
+
         [WorkItem(968256, "http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/968256")]
         [Fact, Trait(Traits.Feature, Traits.Features.Completion)]
         public async Task ShowSnippetsFromOtherContext()

src/Workspaces/CSharpTest/Formatting/FormattingTests.cs

@@ -10078,5 +10078,26 @@ await AssertFormatAsync(
     object F = Func((A,B)((A,B)t)=>t);
 }");
         }
+
+        [Fact, Trait(Traits.Feature, Traits.Features.Formatting)]
+        public async Task LineSpanDirective()
+        {
+            var optionSet = new OptionsCollection(LanguageNames.CSharp) { { FormattingOptions2.UseTabs, true } };
+            await AssertFormatAsync(
+@"class Program
+{
+	static void Main()
+	{
+#line (1, 1) - (1, 100) 5 ""a.razor""
+	}
+}",
+@"class Program
+{
+    static void Main()
+    {
+#line (1,1)-(1,100) 5 ""a.razor""
+    }
+}", changedOptionSet: optionSet);
+        }
     }
 }