E3001

This source files contains invalid or incomplete tokens.

Erroneous example

fn main {
  println('3)
}

This example gives the following error on line 2:

Lexing error: unrecognized character u32:0x27

... which indicates that the compiler don't know how to interpret the dangling character ' (ASCII 0x27) on that line as a part of a MoonBit token.

Suggestion

Change your code to strictly follow the MoonBit syntax rules, so that it only contains valid MoonBit tokens.

In the above example, the missing closing apostrophe should be added:

fn main {
  println('3')
}