Add breaking change doc

alrz · alrz · commit 3387b8a8cca8 · 2019-10-02T22:35:39.000+03:30
diff --git a/docs/compilers/CSharp/Compiler Breaking Changes - post VS2019.md b/docs/compilers/CSharp/Compiler Breaking Changes - post VS2019.md
@@ -80,3 +80,4 @@ In Visual Studio version 16.4, the nullable analysis will be more stringent for
     class C<T> where T : I<(int a, int b)>, I<(int c, int d)> { } // error
     ```
 
+12. Previously, the language version was not checked for `this ref` and `this in` orderings of parameter modifiers. Now these orderings produce an error with langversion below 7.2. See https://github.com/dotnet/roslyn/issues/38486

Original file line number	Diff line number	Diff line change
`@@ -80,3 +80,4 @@ In Visual Studio version 16.4, the nullable analysis will be more stringent for`
`80`	`80`	`class C<T> where T : I<(int a, int b)>, I<(int c, int d)> { } // error`
`81`	`81`	```
`82`	`82`
	`83`	+12. Previously, the language version was not checked for `this ref` and `this in` orderings of parameter modifiers. Now these orderings produce an error with langversion below 7.2. See https://github.com/dotnet/roslyn/issues/38486