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This is GNU Emacs 27.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.8) of 2019-09-29

flycheck-irony.el:38:1:Error: Symbol's function definition is void: rx-submatch-n
zhyd1997
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2 Answers2

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Use the latest version of flycheck. This was fixed in: https://github.com/flycheck/flycheck/commit/9fcdff7ef1f7fdb9e49e9b4c71a6df1d4e5bd705

Use rx-to-string instead of the internal rx-submatch-n, which is gone in Emacs 27 and never was intended for public use.

Iwan in 't Groen
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Commit 2fa33eb earlier today has re-added rx-submatch-n to Emacs 27.0.50, for backward compatibility.

Michael Albinus
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