Nothing
cat("\nTesting val_var()\n")
data(psyo)
e <- val_var("a","character"); if (e != "") {stop(e)}
e <- val_var(1,"numeric"); if (e != "") {stop(e)}
e <- val_var(TRUE,"logical"); if (e != "") {stop(e)}
e <- val_var(psyo$lon,"numeric"); if (e != "") {stop(e)}
e <- val_var(psyo$time,"POSIXct"); if (e != "") {stop(e)}
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