tree e2367b4702fc952435c5edfaebb5f73aa9bf50d7
parent d88df4bd48ba4ce9a68040a2427b4a665d5ff891
author Nick Wellnhofer <wellnhofer@aevum.de> 1597615519 +0200
committer Nick Wellnhofer <wellnhofer@aevum.de> 1597619859 +0200

Fix quadratic runtime in xi:fallback processing

Copying the tree would lead to runtime quadratic in nested fallback
depth, similar to naive string concatenation.