8 Statements [stmt.stmt]

A label can be added to a statement or used anywhere in a compound-statement.

The optional attribute-specifier-seq appertains to the label.

The only use of a label with an identifier is as the target of a goto.

No two labels in a function shall have the same identifier.

A label can be used in a goto statement before its introduction.

A labeled-statement whose label is a case or default label shall be enclosed by ([stmt.pre]) a switch statement ([stmt.switch]).

A control-flow-limited statement is a statement S for which:

• (3.1)
  a case or default label appearing within S shall be associated with a switch statement ([stmt.switch]) within S, and
• (3.2)
  a label declared in S shall only be referred to by a statement ([stmt.goto]) in S.