issues with field initializers

[ericlippert]

The grammar and semantics of field initializers are not quite right in chapter 10.

  field-initializer:
    single-quoted-string-literal  =>  expression
    integer-literal  =>  expression
    qualified-name  =>  expression
    scope-resolution-expression  =>  expression

First, integer literals are -- bizarrely -- not legal on the left side of a field initializer. Named constants that have integer values are legal, which falls under "qualified name". "integer-literal" should be removed.

Second, double-quoted string literals are legal on the left side, provided that they do not contain any evaluated expressions. So "X" would be legal, but "$x" would not. We should add a note to that effect.

[ericlippert]

We should note also that there are other restrictions on the contents of the literal strings. For example '123' and '2hello' are not legal; the strings may not begin with a number. I'm not sure exactly what all the restrictions are; we should enumerate them and put them in the spec.