The potential scope of a parameter
or function-local predefined variable
begins at its point of declaration
.If
the nearest enclosing function declarator
is not the declarator of a function definition,
the potential scope ends at the end of that function declarator
.Otherwise, if
the function has a
function-try-block the potential scope
ends at the end of the last associated handler
.Otherwise the potential scope ends
at the end of the outermost block of the function definition
.A
parameter name shall not be redeclared in the outermost block of the
function definition nor in the outermost block of any handler associated
with a
function-try-block.