"unexpected end of input, expecting end of input"

Weird error message coming from parsec...
```haskell
#!/usr/bin/env stack
-- stack runghc --package parsec

import Data.Map (fromList)
import Text.Parsec

sepBy1Try p sep = do
x <- p
xs <- many (try $ sep *> p)
return (x : xs)

key =
try (string "byr")
<|> try (string "cid")
<|> try (string "eyr")
<|> try (string "ecl")
<|> try (string "hgt")
<|> try (string "hcl")
<|> try (string "iyr")
<|> try (string "pid")

passportKV = try $ do
k <- key
char ':'
v <- many1 (try alphaNum <|> try (char '#'))
return (k, v)

passportLine = sepBy1Try passportKV space

passport = do
lines <- sepBy1Try passportLine endOfLine
return $ fromList [kv | line <- lines, kv <- line]

passports = sepBy1 passport (endOfLine *> ((try endOfLine *> pure ()) <|> eof))

main = do
raw <- readFile "input.txt"
print $ parse passports "(poop)" raw
```
and here's the input file:
[input.txt](https://github.com/haskell/parsec/files/5733606/input.txt)

Here's what I get:
```
❯ ./day4.hs
Left "(poop)" (line 1134, column 1):
unexpected end of input
expecting new-line, end of input, "byr", "cid", "eyr", "ecl", "hgt", "hcl", "iyr" or "pid"
```
which seems... highly counter-intuitive!