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Short program with interface smartcasting does not compile with -skip-unused #24579

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gechandesu opened this issue May 25, 2025 · 1 comment · Fixed by #24583
Closed

Short program with interface smartcasting does not compile with -skip-unused #24579

gechandesu opened this issue May 25, 2025 · 1 comment · Fixed by #24583
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@felipensp
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Bug This tag is applied to issues which reports bugs. Status: Confirmed This bug has been confirmed to be valid by a contributor. Status: Has Workaround This issue has workaround. Unit: markused Bugs/feature requests, that are related to the -skip-unused.

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@gechandesu
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gechandesu commented May 25, 2025 •
edited by github-actions bot
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V version: V 0.4.10 22c327f, press to see full `v doctor` output
V full version V 0.4.10 89d1aac.22c327f
OS linux, Linux version 6.6.8-arch1-1 (linux@archlinux) (gcc (GCC) 13.2.1 20230801, GNU ld (GNU Binutils) 2.41.0) #1 SMP PREEMPT_DYNAMIC Thu, 21 Dec 2023 19:01:01 +0000
Processor 16 cpus, 64bit, little endian, 12th Gen Intel(R) Core(TM) i5-1240P
Memory 2.55GB/15.35GB
V executable /home/ge/.vlang/v
V last modified time 2025-05-24 11:12:38
V home dir OK, value: /home/ge/.vlang
VMODULES OK, value: /home/ge/.vmodules
VTMP OK, value: /tmp/v_1000
Current working dir OK, value: /tmp
env VFLAGS "-W"
Git version git version 2.49.0
V git status weekly.2025.16-203-g22c327fe
.git/config present true
cc version cc (GCC) 15.1.1 20250425
gcc version gcc (GCC) 15.1.1 20250425
clang version clang version 19.1.7
tcc version tcc version 0.9.28rc 2024-07-31 HEAD@1cee0908 (x86_64 Linux)
tcc git status thirdparty-linux-amd64 0134e9b9
emcc version N/A
glibc version ldd (GNU libc) 2.41

What did you do?
./v -g -o vdbg cmd/v && ./vdbg myerr.v && myerr

module main

pub struct MyError implements IError {
pub:
	msg    string
	code   int
	domain int
	level  int
}

pub fn (e MyError) str() string {
	return '${e.msg} ${e.code}:${e.domain}:${e.level}'
}

pub fn (e MyError) msg() string {
	return e.msg
}

pub fn (e MyError) code() int {
	return e.code
}

fn MyError.new(msg string, code int, domain int, level int) MyError {
	return MyError{
		msg:    msg
		code:   code
		domain: domain
		level:  level
	}
}

fn foo() ! {
	return MyError.new('xxx', 1, 1, 1)
}

fn main() {
	foo() or {
		if err is MyError {
			eprintln(err)
		}
	}
}

What did you see?

================== C compilation error (from tcc): ==============
cc: /tmp/v_1000/myerr.01JW4R108Q4DGSDVXSEWWGEVDE.tmp.c:5685: warning: implicit declaration of function 'isnil'
cc: /home/ge/.vlang/thirdparty/tcc/lib/libgc.a: error: 'GC_noop1_ptr' defined twice
cc: tcc: error: undefined symbol 'isnil'
=================================================================
(You can pass `-cg`, or `-show-c-output` as well, to print all the C error messages).
builder error: 
==================
C error found. It should never happen, when compiling pure V code.
This is a V compiler bug, please report it using `v bug file.v`,
or goto https://github.com/vlang/v/issues/new/choose .
You can also use #help on Discord: https://discord.gg/vlang .

What did you expect to see?

Program should print xxx 1:1:1

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@felipensp felipensp added Bug This tag is applied to issues which reports bugs. Status: Confirmed This bug has been confirmed to be valid by a contributor. Status: Has Workaround This issue has workaround. Unit: markused Bugs/feature requests, that are related to the -skip-unused. labels May 26, 2025
@felipensp felipensp self-assigned this May 26, 2025
@felipensp felipensp mentioned this issue May 26, 2025
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@felipensp felipensp

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Bug This tag is applied to issues which reports bugs. Status: Confirmed This bug has been confirmed to be valid by a contributor. Status: Has Workaround This issue has workaround. Unit: markused Bugs/feature requests, that are related to the -skip-unused.
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markused: fix usage marking for printling interface smartcasted on short program felipensp/v
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@felipensp @gechandesu