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read syntax vectors immutable

From: j kalbhenn
Subject: read syntax vectors immutable
Date: Thu, 22 Jun 2017 09:04:58 +0000
User-agent: Mutt/1.8.3 (2017-05-23)

vectors created using read syntax are apparently immutable with guile 2.2.2:

(define a #(0))
(if (vector? a) (vector-set! a 0 1))

In procedure vector-set!: Wrong type argument in position 1 (expecting mutable 
vector): #(0)

is this documented somewhere in the guile manual or part of the scheme 
standard? i could not find anything about it.

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