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Unrecognized attribute with a pack expansion in its arguments [GH #412] - #424
We call record_pack_expansion_ellipsis_position for unrecognized attributes presumably to silence an error that would occur when we don't know the attribute in a pack expansion e.g. acquire_capability(m...). We keep the arguments as plain text tokens and therefore we don't see it as expanding m (error). So we add a ... when there isn't one and record an expansion and sets the flag.
The attempted fix still fakes the ... but only skips setting the flag. The printer stops writing the extra ... but instantiation still repeats or drops the attribute.
This change doesn't fake the expansion. If no real ... follows an unrecognized attribute it would just throw away the pack names collected from the attribute's arguments.
Summary by CodeRabbit
Bug Fixes
Improved handling of unrecognized attributes that reference parameter packs in C++ templates. Pack expansions are now distinguished from cases that are not expansions, preventing incorrect diagnostics and instantiation behavior.
Tests
Added regression coverage for expanded and unexpanded pack arguments, including packs of different lengths.
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Walkthrough
The change adjusts how the compiler handles pack references in unrecognized attributes during pack expansion. It adds regression tests for expanded and unexpanded attribute arguments and for references to parameter packs of different lengths.
Attribute scanning suppresses the no-packs diagnostic when it sees an ellipsis. Otherwise, it discards pack references for the context. The new helper acts only in qualifying prototype-scan contexts. The changelog describes the fix.
Regression tests cover attribute pack expansion, unexpanded pack arguments, empty and multiple packs, and references to packs of different lengths. Expected output records attribute expansion flags and test commands.
Issue 412 reports extra generated C++ ellipsis for an unrecognized attribute argument containing a pack expansion. This change updates pack-reference handling for that case.
Suggested labels:bug
Suggested reviewers:nv-cmeerw, daveedvdv
Merge Risk: Minimal · up to 100c2
Unexpanded attribute pack references are discarded as intended. No merge-blocking risk was established.
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The title clearly and concisely describes the main change: handling unrecognized attributes with pack expansions in their arguments. It also includes the relevant issue reference.
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- Around line 3-4: Move the new “Unrecognized attribute with a pack expansion in
its arguments” changelog entry out of the consolidated changelog and into the
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…cpp#412]
We call record_pack_expansion_ellipsis_position for unrecognized
attributes presumably to silence an error that would occur when
we don't know the attribute in a pack expansion e.g.
acquire_capability(m...). We keep the arguments as plain text
tokens and therefore we don't see it as expanding m (error).
So we add a ... when there isn't one and record an expansion
and sets the flag.
The attempted fix still fakes the ... but only skips setting the
flag. The printer stops writing the extra ... but instantiation
still repeats or drops the attribute.
This change doesn't fake the expansion. If no real
... follows an unrecognized attribute it would just throw away
the pack names collected from the attribute's arguments.
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We call record_pack_expansion_ellipsis_position for unrecognized attributes presumably to silence an error that would occur when we don't know the attribute in a pack expansion e.g. acquire_capability(m...). We keep the arguments as plain text tokens and therefore we don't see it as expanding m (error). So we add a ... when there isn't one and record an expansion and sets the flag.
The attempted fix still fakes the ... but only skips setting the flag. The printer stops writing the extra ... but instantiation still repeats or drops the attribute.
This change doesn't fake the expansion. If no real ... follows an unrecognized attribute it would just throw away the pack names collected from the attribute's arguments.
Summary by CodeRabbit