Add an assert

Neme12 · Neme12 · commit 9f89605a95fc · 2022-06-03T00:21:37.000+02:00
diff --git a/src/Compilers/CSharp/Portable/Parser/SlidingTextWindow.cs b/src/Compilers/CSharp/Portable/Parser/SlidingTextWindow.cs
@@ -344,6 +344,8 @@ public char PeekChar()
         /// </returns>
         public char PeekChar(int delta)
         {
+            Debug.Assert(delta >= 0);
+
             int position = this.Position;
             this.AdvanceChar(delta);
 

Original file line number	Diff line number	Diff line change
`@@ -344,6 +344,8 @@ public char PeekChar()`
`344`	`344`	`/// </returns>`
`345`	`345`	`public char PeekChar(int delta)`
`346`	`346`	`{`
	`347`	`+ Debug.Assert(delta >= 0);`
	`348`	`+`
`347`	`349`	`int position = this.Position;`
`348`	`350`	`this.AdvanceChar(delta);`
`349`	`351`