Compiler json dump inserts invalid json character at end of output

[jyapayne]

This is causing the nim vim plugin to throw an error every time a Nim file is opened.

Example

# x.nim
echo "Hello World!"
# Compile with `nim --dump.format:json --verbosity:0 dump x.nim > out.json`

Current Output

Expected Output

Possible Solution

Seems to be something from this PR after investigating using git bisect.

Nim Compiler Version 1.5.1 [MacOSX: arm64]
Compiled at 2021-04-25
Copyright (c) 2006-2021 by Andreas Rumpf

git hash: 9e6f2d7d186f760d8eb7dc26c863f23bd044b9c9
active boot switches: -d:release

[timotheecour]

I was going to report the same issue:
nim dump --dump.format:json . | jq -r .nimExe now fails after that PR