[Ada] Fix visibility inside declare_expression

The first implementation just created a scope for the analysis of the
declarations and the expression, so that visibility would just work as
it does for all other constructs. However this led to an annoying bug
when one of the declarations or the expression itself creates a
transient scope: there may be a confusion on scope exit between those
two scopes. As a result visibility is handled by explicit traversal of
the expression and replacement of occurrences of the local variables,
see Replace_Local_Ref in Resolve_Declare_Expression (sem_res.adb). The
current code does not take into account that there may be references to
a local object in a subsequent declaration (not just in the expression).

gcc/ada/

	* sem_res.adb (Resolve_Declare_Expression): Traverse the
	expression to replace references to local variables that occur
	within declarations of the declare_expression; fix typos in
	comments.

0 files changed, 0 insertions, 0 deletions