[BUG]: mojo crash: Assertion `addedNew && "duplicate argument name in signature"' failed.

[junweizeng]

Bug description

mojo crashes on the following code (i.e. test.mojo).

@value
struct a:
    var b
    var b
a()

Steps to reproduce

$ mojo build test.mojo
/path/to/test.mojo:5:1: error: TODO: expressions are not yet supported at the file scope level
a()
^
/path/to/test.mojo:4:5: error: invalid redefinition of 'b'
    var b
    ^
/path/to/test.mojo:3:5: note: previous definition here
    var b
    ^
/path/to/test.mojo:3:11: error: struct field declaration must have a type
    var b
          ^
mojo: /__w/modular/modular/KGEN/lib/MojoParser/OverloadFitness.cpp:817: static M::KGEN::LIT::OverloadFitness M::KGEN::LIT::OverloadFitness::evaluate(M::KGEN::LIT::LITSignatureType, const M::KGEN::LIT::OverloadSet &, const M::KGEN::LIT::CallOperands &, bool, M::KGEN::LIT::ExprEmitter &): Assertion `addedNew && "duplicate argument name in signature"' failed.
[10814:10814:20240126,124622.346936:ERROR file_io_posix.cc:144] open /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq: No such file or directory (2)
[10814:10814:20240126,124622.347117:ERROR file_io_posix.cc:144] open /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq: No such file or directory (2)
Please submit a bug report to https://github.com/modularml/mojo/issues and include the crash backtrace along with all the relevant source codes.
Stack dump:
0.      Program arguments: mojo build test.mojo
1.      Crash resolving decl body at loc("/path/to/test.mojo":1:1)
    >> @value
       ^.....
    >> struct a:
    >>     var b
    >>     var b
    >> a()
       ...<
2.      Crash parsing statement at loc("/path/to/test.mojo":5:1)
    >> a()
       ^..<
 #0 0x000055a6383aaee7 (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0x60fee7)
 #1 0x000055a6383a8abe (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0x60dabe)
 #2 0x000055a6383ab5bf (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0x6105bf)
 #3 0x00007f4667591520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x00007f46675e59fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x00007f4667591476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x00007f46675777f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x00007f466757771b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x00007f4667588e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x000055a6388a47f8 (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0xb097f8)
#10 0x000055a638899aaa (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0xafeaaa)
#11 0x000055a6388a0408 (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0xb05408)
#12 0x000055a638853c01 (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0xab8c01)
#13 0x000055a6388452d9 (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0xaaa2d9)
#14 0x000055a63887b2bc (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0xae02bc)
#15 0x000055a6388780d8 (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0xadd0d8)
#16 0x000055a638877f76 (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0xadcf76)
#17 0x000055a63881a443 (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0xa7f443)
#18 0x000055a638831a19 (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0xa96a19)
#19 0x000055a6387e991a (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0xa4e91a)
#20 0x000055a6387f60c6 (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0xa5b0c6)
#21 0x000055a6387f5fb0 (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0xa5afb0)
#22 0x000055a63a1777da (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0x23dc7da)
#23 0x000055a63a17e1af (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0x23e31af)
#24 0x000055a63a17e635 (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0x23e3635)
#25 0x000055a63a61b609 (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0x2880609)
#26 0x000055a63a61b879 (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0x2880879)
#27 0x000055a63a616554 (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0x287b554)
#28 0x000055a63a17cb50 (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0x23e1b50)
#29 0x000055a6387e9456 (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0xa4e456)
#30 0x000055a6387e69aa (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0xa4b9aa)
#31 0x000055a6387e82b0 (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0xa4d2b0)
#32 0x000055a6387d9cb2 (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0xa3ecb2)
#33 0x000055a6387d87e5 (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0xa3d7e5)
#34 0x000055a6387d8b60 (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0xa3db60)
#35 0x000055a63835d5cf (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0x5c25cf)
#36 0x000055a63835fc6b (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0x5c4c6b)
#37 0x000055a63835a79a (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0x5bf79a)
#38 0x000055a638359122 (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0x5be122)
#39 0x00007f4667578d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#40 0x00007f4667578e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#41 0x000055a63835892e (/home/jwzeng/.modular/pkg/packages.modular.com_mojo/bin/mojo+0x5bd92e)
Aborted

System information

- Ubuntu 22.04.3 LTS (WSL 2)
- mojo 0.6.3 (f58f8b94)
- modular 0.3.1 (589ce200)

[laszlokindrat]

Thanks for opening the ticket! I was able to reproduce the crash; the fix will be available in an upcoming release. Please continue to open issues if you run into problems!