[R] "unexpected numeric constant" while reading tab delimited csv file

[madr]

my csv file is very simple - just one line for purpose of this test:
0{TAB}0

and read function is this:
csvdata = read.csv(file="d:/s/test.csv",head=FALSE,sep="\t")

then error comes:

Error in source("d:/test.csv") : 
  d:/test.csv:1:9: unexpected numeric constant
1: 0       0


but when I change delimiter to ; (colon) then error not shows up anymore
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