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bug#45610: 27.1; Symbol’s function definition is void: seq-concatenate

From: Leo Liu
Subject: bug#45610: 27.1; Symbol’s function definition is void: seq-concatenate
Date: Sat, 02 Jan 2021 22:22:35 +0800
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (macOS 10.14.6) 
On 2021-01-02 14:47 +0200, Eli Zaretskii wrote:
> What did that expand to in Emacs 26?

The body of cl-concatenate before Emacs 27:

(pcase type
   (`vector (apply #'vconcat sequences))
   (`string (apply #'concat sequences))
   (`list (apply #'append (append sequences '(nil))))
   (_ (error "Not a sequence type name: %S" type)))
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