asp.net mvc 3 - Possible breaking change in MVC4 Razor that can be fixed with "@:@" -

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I recently upgraded my website to ASP.Net MVC3 (Razor) to MVC 4 (Razor 2) , And doing so seemed like what it seemed like a breaker change in a razor-view engine.

The scenario (very simplified) is shown below. 

  @Electrical IEnumerable & lt; String & gt; @ {Layout = null; } & Lt ;! DOCTYPE html & gt; & Lt; Html & gt; & Lt; Body & gt; & Lt; Div & gt; @foreach (X in Model) {@ string.format ("Foo Bar: {0}", x) // MVC4 / Razor2} errors & lt; / Div & gt; & Lt; / Body & gt; & Lt; / Html & gt;   
 This works fine in MVC3 / Razor, however results in an error in the  string.Format  line in MVC4 / Razor2:  
 
 Unexpected "string" keyword after the "@" character. Once inside the code, you do not need a prefix with "@" like "string".   
 If you delete  @ , the visual engine then asks that you end the line with the semicolon  string.format  Give. However, Rishers then warns (correctly):  
 
 The return value of the net method is not used.   
 I made two fixes for this I  & lt; Text & gt; :  
  & lt; Text & gt; @ String.Format ("value {0}", x) & lt; / Text & gt; to use.   
 or  @: @ :  
  @: @ string.format ("value {0}", X) < / Code>  
 Is this a known and documented change in the RazorView engine?   
 
 
 It looks like a bug, it's  string :   @foreach (var x in model) {@ String.Format ("Foo bar: {0}", x)}

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