debugEcho

See the docs

"Same as echo, but as a special semantic rule, debugEcho pretends to be free of side effects, so that it can be used for debugging routines marked as noSideEffect."

func add(x, y: int): int =
# echo "# inside add():" # Error: side effect
debugEcho "# inside add():" # OK, works
x + y

echo add(3, 5) # 8

Notice that add() is a func, i.e. it cannot have any side effects.

Output:

# inside add():
8

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Page last modified on 2026 May 27, 11:52