Move langversion check to the parser

dotnet · May 4, 2021 · d3f1e7f · d3f1e7f
1 parent 4897191
commit d3f1e7f
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Showing 3 changed files with 13 additions and 5 deletions.
diff --git a/src/Compilers/CSharp/Portable/Binder/Binder_Patterns.cs b/src/Compilers/CSharp/Portable/Binder/Binder_Patterns.cs
@@ -1184,10 +1184,6 @@ private ImmutableArray<BoundSubpattern> BindPropertyPatternClause(
  var memberBuilder = ArrayBuilder<Symbol>.GetInstance();
  LookupMembersForPropertyPattern(inputType, expr, memberBuilder, diagnostics, ref hasErrors, out memberType);
  members = memberBuilder.ToImmutableAndFree();
- if (!hasErrors && members.Length > 1)
- {
- MessageID.IDS_FeatureExtendedPropertyPatterns.CheckFeatureAvailability(diagnostics, this.Compilation, expr.GetLocation());
- }
  }
 
  BoundPattern boundPattern = BindPattern(pattern, memberType, GetValEscape(memberType, inputValEscape), permitDesignations, hasErrors, diagnostics);

diff --git a/src/Compilers/CSharp/Portable/Parser/LanguageParser_Patterns.cs b/src/Compilers/CSharp/Portable/Parser/LanguageParser_Patterns.cs
@@ -599,7 +599,7 @@ private SubpatternSyntax ParseSubpatternElement()
  var colon = EatToken();
  exprColon = expr is IdentifierNameSyntax identifierName
  ? _syntaxFactory.NameColon(identifierName, colon)
- : _syntaxFactory.ExpressionColon(expr, colon);
+ : _syntaxFactory.ExpressionColon(CheckFeatureAvailability(expr, MessageID.IDS_FeatureExtendedPropertyPatterns), colon);
 
  pattern = ParsePattern(Precedence.Conditional);
  }

diff --git a/src/Compilers/CSharp/Test/Syntax/Parsing/PatternParsingTests2.cs b/src/Compilers/CSharp/Test/Syntax/Parsing/PatternParsingTests2.cs
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
+using Microsoft.CodeAnalysis.CSharp.Test.Utilities;
 using Microsoft.CodeAnalysis.Test.Utilities;
 using Xunit;
 using Xunit.Abstractions;
@@ -24,6 +25,16 @@ public PatternParsingTests2(ITestOutputHelper output) : base(output)
  public void ExtendedPropertySubpattern_01()
  {
  UsingExpression(@"e is { a.b.c: p }");
+ verify();
+
+ UsingExpression(@"e is { a.b.c: p }", TestOptions.Regular9,
+ // (1,8): error CS8652: The feature 'extended property patterns' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
+ // e is { a.b.c: p }
+ Diagnostic(ErrorCode.ERR_FeatureInPreview, "a.b.c").WithArguments("extended property patterns").WithLocation(1, 8));
+ verify();
+
+ void verify()
+ {
 
  N(SyntaxKind.IsPatternExpression);
  {
@@ -77,6 +88,7 @@ public void ExtendedPropertySubpattern_01()
  }
  EOF();
  }
+ }
 
  [Fact]
  public void ExtendedPropertySubpattern_02()