2019-12-16 Ed Schonberg <schonberg@adacore.com>
gcc/ada/
* scng.adb (Scan): In Ada2020, a left-bracket indicates the
start of an homogenous aggregate.
* par-ch4.adb (P_Reduction_Attribute_Reference): New procedure.
(P_Aggregate): Recognize Ada2020 bracket-delimited aggregates.
(P_Primary): Ditto.
* par-util.adb (Comma_Present): Return false on a right bracket
in Ada2020, indicating the end of an aggregate.
* snames.ads-tmpl: Introduce Name_Reduce and Attribute Reduce.
* sinfo.ads, sinfo.adb (Is_Homogeneous_Aggregate): New flag on
aggregates, to designate an Ada2020 array or container aggregate
that is bracket-delimited in the source.
* sem_attr.adb (Analyze_Attribute): For attribute Reduce, verify
that two arguments are present, and verify that the prefix is a
stream or an object that is iterable (array or contrainer).
(Resolve_Attribute): For attribute Reduce, resolve initial value
with the type of the context. Type-checking of element type of
prefix is performed after expansion.
* exp_attr.adb (Expand_N_Attribute_Reference): For attribute
Reduce, expand into a loop: a) If prefix is an aggregate with a
single iterated component association, use its iterator
specification to construct a loop, b) If prefix is a name, build
a loop using an element iterator loop.
* scans.ads: Add brackets tokens.
From-SVN: r279431
