Fix a concatenation coalescing issue#859
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natecook1000 merged 4 commits intomainfrom Apr 16, 2026
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The recursive DSLTree approach required nodes nested in nodes. The DSLTree implementation flattened this tree, but didn't remove the nested nodes, instead replacing them with placeholder entries that were unused, in order to reduce the code change. This change completes the transition, modifying the nodes to no longer store their children. With this change, we can also remove a significant amount of unused code. The change includes some expanded test coverage of the RegexBuilder syntax conversion, as well. Note that even though `DSLTree.Node` no longer requires declaration as `indirect`, compilation times are worsened if we remove the indirection.
This addresses an out of bounds access when coalescing certain concatenation patterns. rdar://174353630
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This addresses an out of bounds access when coalescing certain concatenation patterns.
rdar://174353630