Proposal for referring to values at labels #182
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| reference. (visibility as defined by Ada RM is not strict enough, | ||
| as ``statement_identifier`` are implicitly declared in innermost declare block) |
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Can you give an example to illustrate this?
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To my understanding this means that something like
X := 1;
<<My_Label>>
X := 2;
declare
Y : Integer := 0;
begin
pragma Assert ((X-1)'At (My_Label) = Y);
end;is not allowed.
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A label is declared in the innermost declare block enclosing the label. So this would be legal.
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A few lines below: "Furthermore, the statement_identifier referenced by an 'At attribute and the attribute itself shall have the same innermost enclosing body."
To my understanding, this would make it illegal as <<My_Label>> and (X-1)'At (My_Label) do not have the same innermost enclosing body.
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Enclosing body is not the same as enclosing declare block. A "body" refers to a function, procedure, task, or package body.
| a constant at a non-visible (or following) labels. The equivalence also | ||
| means that the scope of the constant is the surrounding sequence of | ||
| statements of the label. In particular, associated finalization will | ||
| occurr at the end of the sequence, rather than immediately after the |
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Typo: "occurr" -> "occur" (there are two similar ones below).
| ``` | ||
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| That equivalence implies that it is not allowed to refer to the value of | ||
| a constant at a non-visible (or following) labels. The equivalence also |
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