Matthieu Pizenberg (Dec 01 2025 at 09:17): Matthieu Pizenberg (Dec 01 2025 at 09:17):Is there an stdout function that prints multiple lines? or just the line! one?
Luke Boswell (Dec 01 2025 at 09:19):Just the line one for now
Luke Boswell (Dec 01 2025 at 09:19):You could write one that wraps that
Matthieu Pizenberg (Dec 01 2025 at 09:23):oh there is no multiline string yet in the new roc?
input =
"""
L68
L30
R48
L5
R60
L55
L1
L99
R14
L82
"""
print! = |msg| {
for line in msg.split_on("\n") {
Stdout.line!(line)
}
}
main! = |_args| {
Stderr.line!("Hello")
dbg input.trim()
print!(input.trim())
Ok({})
}
This produces no dbg output
Luke Boswell (Dec 01 2025 at 09:26):multiline strings use double backslash \\
Luke Boswell (Dec 01 2025 at 09:26):input =
\\1 2
\\3 4
\\5 6
Thanks! will be worth adding to Richard gist I think!
Matthieu Pizenberg (Dec 01 2025 at 09:30):I’ve removed my debug statement, and the program seems to still be trying to do some debug that creates an error:
❯ roc day01.roc
Hello
L68
L30
R48
L5
R60
L55
L1
L99
R14
L82
error(gpa): memory address 0x1032c0040 leaked:
Unable to print stack trace: Unable to open debug info: MissingDebugInfo
error(gpa): memory address 0x1032c0080 leaked:
Unable to print stack trace: Unable to open debug info: MissingDebugInfo
Is this an error I should try to minify and create an issue?
Matthieu Pizenberg (Dec 01 2025 at 09:34):It seems the memory leak is detected as soon as I add the 7th line in my multiline string.
input =
\\L68
\\L30
\\R48
\\L5
\\R60
\\L55
\\L1 # <- memory leak triggers here
#\\L99
#\\R14
#\\L82
print! = |msg| {
for line in msg.split_on("\n") {
Stdout.line!(line)
}
}
main! = |_args| {
#Stderr.line!("Hello")
#dbg input
print!(input.trim())
Ok({})
}
I opened an issue with it: https://github.com/roc-lang/roc/issues/8525
Luke Boswell (Dec 01 2025 at 10:27):Fixed in https://github.com/roc-lang/roc/pull/8527
Last updated: Dec 21 2025 at 12:15 UTC