This is a recent R-devel. file.copy() is not vectorized if multiple
destinations succeed:
cat("foo1\n", file = "foo1")
cat("foo2\n", file = "foo2")
unlink(c("copy1", "copy2"), recursive = TRUE)
file.copy(c("foo1", "foo2"), c("copy1", "copy2"), copy.date = TRUE)
#> Error in Sys.setFileTime(to[okay], fi$mtime) : invalid 'path' argument
# But the files were still copied:
file.exists(c("copy1", "copy2"))
#> [1] TRUE TRUE
file.copy(c("foo1", "foo2"), c("copy1", "copy2"))
#> [1] FALSE FALSE
file.copy(c("foo1", "foo2"), c("copy1", "copy2"), copy.date = TRUE)
#> [1] FALSE FALSE
file.copy(c("foo1", "foo2"), c("copy1", "copy2"), copy.date = TRUE,
overwrite = TRUE)
#> Error in Sys.setFileTime(to[okay], fi$mtime) : invalid 'path' argument
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