/usr/share/doc/r-cran-tibble/tests/testthat/output/trunc_mat/zero_rows--30.txt is in r-cran-tibble 1.4.1-1ubuntu1.
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The actual contents of the file can be viewed below.
1 2 3 4 | # A tibble: 0 x 2
<body created by pillar>
# ... with 2 variables:
# a <chr>, b <lgl>
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