all all 3 non-; return forms (#580)

Author: RexJaeschke

standard/classes.md

@@ -2751,7 +2751,7 @@ Partial methods may be defined in one part of a type declaration and implemented
 
 Partial methods shall not define access modifiers; they are implicitly private. Their return type shall be `void`, and their parameters shall not have the `out` modifier. The identifier partial is recognized as a contextual keyword ([§6.4.4](lexical-structure.md#644-keywords)) in a method declaration only if it appears immediately before the `void` keyword. A partial method cannot explicitly implement interface methods.
 
-There are two kinds of partial method declarations: If the body of the method declaration is a semicolon, the declaration is said to be a ***defining partial method declaration***. If the body is given as a *block*, the declaration is said to be an ***implementing partial method declaration***. Across the parts of a type declaration, there may be only one defining partial method declaration with a given signature, and there may be only one implementing partial method declaration with a given signature. If an implementing partial method declaration is given, a corresponding defining partial method declaration shall exist, and the declarations shall match as specified in the following:
+There are two kinds of partial method declarations: If the body of the method declaration is a semicolon, the declaration is said to be a ***defining partial method declaration***. If the body is other than a semicolon, the declaration is said to be an ***implementing partial method declaration***. Across the parts of a type declaration, there may be only one defining partial method declaration with a given signature, and there may be only one implementing partial method declaration with a given signature. If an implementing partial method declaration is given, a corresponding defining partial method declaration shall exist, and the declarations shall match as specified in the following:
 
 - The declarations shall have the same modifiers (although not necessarily in the same order), method name, number of type parameters and number of parameters.
 - Corresponding parameters in the declarations shall have the same modifiers (although not necessarily in the same order) and the same types (modulo differences in type parameter names).