Chaos corruption issue: https://github.com/chaos-lang/chaos/blob/issue/corruption/interpreter/symbol.c#L120-L155

dev.kaos

num def f1()
    num a = 101
    return a
end

num def f2()
    num b = 102
    return b
end

num def f3()
    num c = 103
    return c
end

num def f4(num x, num y)
    num z = x + y
    bool a = true
end {
    z > 5   : break,
    z == 8  : f1(),
    z > 10  : f2(),
    default : f3()
}

list a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]

void def f6(num list a)
    foreach a as el
        print f4(el, 1)
    end
end

f6(a)

dev.sh

#!/bin/bash

# related code https://github.com/chaos-lang/chaos/blob/issue/corruption/interpreter/symbol.c#L120-L155

git clone -b issue/corruption https://github.com/chaos-lang/chaos.git --depth 1 && \
cd chaos && \
make clang-dev-sanitizer-memory && \
make clang && \
sudo make install && \
make test && \
chaos dev.kaos

stderr.out

==463398==WARNING: MemorySanitizer: use-of-uninitialized-value
    #0 0x4ecffe in removeChildrenOfComplex /home/mertyildiran/Documents/chaos/interpreter/symbol.c:1486:32
    #1 0x4ecb8e in removeSymbol /home/mertyildiran/Documents/chaos/interpreter/symbol.c:124:5
    #2 0x4d630a in executeDecision /home/mertyildiran/Documents/chaos/interpreter/function.c:810:13
    #3 0x4d5b62 in callFunctionCleanUp /home/mertyildiran/Documents/chaos/interpreter/function.c:327:9
    #4 0x4e6af9 in eval_node_after_function_call /home/mertyildiran/Documents/chaos/interpreter/interpreter.c:1535:5
    #5 0x4dd42a in eval_node /home/mertyildiran/Documents/chaos/interpreter/interpreter.c:351:34
    #6 0x4e85da in startForeach /home/mertyildiran/Documents/chaos/interpreter/loop.c:107:12
    #7 0x4e47f4 in eval_node /home/mertyildiran/Documents/chaos/interpreter/interpreter.c:377:20
    #8 0x4db6fc in interpret /home/mertyildiran/Documents/chaos/interpreter/interpreter.c:89:9
    #9 0x4bb421 in initParser /home/mertyildiran/Documents/chaos/parser/parser.c:201:17
    #10 0x4b32f3 in main /home/mertyildiran/Documents/chaos/parser/parser.y:951:5
    #11 0x7ff001c970b2 in __libc_start_main /build/glibc-ZN95T4/glibc-2.31/csu/../csu/libc-start.c:308:16
    #12 0x41c49d in _start (/usr/local/bin/chaos+0x41c49d)

  Uninitialized value was created by a heap deallocation
    #0 0x4228b9 in free (/usr/local/bin/chaos+0x4228b9)
    #1 0x4ed17b in freeSymbol /home/mertyildiran/Documents/chaos/interpreter/symbol.c:154:5

SUMMARY: MemorySanitizer: use-of-uninitialized-value /home/mertyildiran/Documents/chaos/interpreter/symbol.c:1486:32 in removeChildrenOfComplex
Exiting