Add 'body' to the list of deprecated features

RIP, you won't be missed.
Support for dlang/dmd#10693

Author: Geod24

deprecate.dd

@@ -10,6 +10,7 @@ $(SPEC_S Deprecated Features,
 
     $(TABLE2 Deprecated Features,
         $(THEAD Feature,                                                          Spec,  Dep,    Error,  Gone)
+        $(TROW $(DEPLINK body keyword),                                           2.075, 2.091,  ,  )
         $(TROW $(DEPLINK Hexstring literals),                                     2.079, 2.079, 2.086,  )
         $(TROW $(DEPLINK Class allocators and deallocators),                       , 2.080, 2.087,  )
         $(TROW $(DEPLINK Implicit comparison of different enums),                 2.075,  2.075, 2.081,  )
@@ -60,6 +61,38 @@ $(SPEC_S Deprecated Features,
         $(DD The feature is completely gone)
     )
 
+$(H3 $(DEPNAME body keyword))
+    $(P 'body' was a keyword used to specify a function/method's body in the presence of contracts
+        ---
+        class Foo
+        {
+            void bar(int i)
+            in { assert(i >= 42); }
+            body { /* Do something interesting */ }
+
+            string method(string s)
+            out(v) { assert(v.length == s.length); }
+            body { /* Do something even more interesting */ }
+
+            void noBody() { /* No contracts, no body */ }
+        }
+        ---
+    )
+$(H4 Corrective Action)
+    $(P Use the 'do' keyword instead (introduced v2.075.0)
+        ---
+        void bar(int i)
+        in { assert(i >= 42); }
+        do { /* Look ma, no body! */ }
+        ---
+    )
+$(H4 Rationale)
+    $(P The 'body' keyword was only used for this single purpose.
+        Since D grammar aims to be context free, this common word was reserved,
+        which led to frequent trouble for people interfacing with other languages
+        (e.g. javascript) or auto-generating code.
+    )
+
 $(H3 $(DEPNAME Hexstring literals))
     $(P Hexstring literals can be used to enter literals in base 16.
         ---