why is pnas_article failing on Travis?

Author: yihui

inst/rmarkdown/templates/pnas_article/skeleton/skeleton.Rmd

@@ -59,7 +59,9 @@ csl: pnas.csl
 ## change to true to add optional line numbering
 lineno: false
 
-output: rticles::pnas_article
+output:
+  rticles::pnas_article:
+    keep_tex: true
 ---
 
 

tests/testit/test-formats.R

@@ -18,6 +18,10 @@ test_format <- function(name, os_skip = NULL) {
     create_dir = FALSE, edit = FALSE
   )
 
+  if (name == 'pnas_article') on.exit({
+    print(xfun::file_string(xfun::with_ext(testdoc, '.tex')))
+    print(xfun::file_string(xfun::with_ext(testdoc, '.log')))
+  }, TRUE, FALSE)
   message('Rendering the ', name, ' format...')
   output_file <- rmarkdown::render(testdoc, quiet = TRUE)
   assert(paste(name, "format works"), {