My son Patrick asked me to send report this bug to the list before he
left on a 3 day course.

The following works:

a <- list(1,2)
a[1] <- paste(1)
a

The following causes a segmentation fault:

a <- matrix(1:9,nrow=3)
dimnames(a) <- list(paste(1:3),paste(1:3))
a
dimnames(a)[2] <- paste(1:3)
a

The second last line gives a couple of warnings and the last line
gives the segmentation fault on both 0.63 and 0.63.1. Using double square
brackets works in both cases. Jim
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