Snippet that ends at EOF is missing last character

[externl]

When you compile

module A

[a

ensuring there is no ending newline, just [aEOF, the a is missing from the snippet.

error [E002]: invalid syntax: expected one of '(' or ']', but found 'EOF'
 --> foo.slice:3:3
  |
3 | [
  |  /\
  |

Failed: Compilation failed with 1 error(s)