Revert

CyrusNajmabadi · CyrusNajmabadi · commit c2298303bdda · 2022-10-28T10:14:19.000-07:00
diff --git a/src/Compilers/CSharp/Portable/Parser/LanguageParser.cs b/src/Compilers/CSharp/Portable/Parser/LanguageParser.cs
@@ -8286,10 +8286,11 @@ private bool IsPossibleDeclarationStatementFollowingNullableType()
             }
 
             // looks like a property:
+            //      T? Goo {
             //
-            //  T? Goo {
-            //  T? Goo =>
-            if (this.CurrentToken.Kind is SyntaxKind.OpenBraceToken or SyntaxKind.EqualsGreaterThanToken)
+            // Importantly, we don't consider `T? Goo =>` to be the start of a property.  This is because it's legal to write:
+            //      T ? Goo => Goo : Bar => Bar
+            if (this.CurrentToken.Kind is SyntaxKind.OpenBraceToken)
             {
                 return true;
             }

Original file line number	Diff line number	Diff line change
`@@ -8286,10 +8286,11 @@ private bool IsPossibleDeclarationStatementFollowingNullableType()`
`8286`	`8286`	`}`
`8287`	`8287`
`8288`	`8288`	`// looks like a property:`
	`8289`	`+ // T? Goo {`
`8289`	`8290`	`//`
`8290`		`- // T? Goo {`
`8291`		`- // T? Goo =>`
`8292`		`- if (this.CurrentToken.Kind is SyntaxKind.OpenBraceToken or SyntaxKind.EqualsGreaterThanToken)`
	`8291`	+ // Importantly, we don't consider `T? Goo =>` to be the start of a property. This is because it's legal to write:
	`8292`	`+ // T ? Goo => Goo : Bar => Bar`
	`8293`	`+ if (this.CurrentToken.Kind is SyntaxKind.OpenBraceToken)`
`8293`	`8294`	`{`
`8294`	`8295`	`return true;`
`8295`	`8296`	`}`