I thought dynamic arrays were unavailable under -betterC.

Example_02:

extern(C) void main() {
   import core.stdc.stdio : printf;
   int[] A;
   printf("Hello betterC\n");
}

dmd -betterC -run Example_02

Expected result: Failure at compilation stage, owing to presence of dynamic array A, when -betterC set.
Actual result: Ran to completion, dislaying the message.

Example_03:

void main() {
   import core.stdc.stdio : printf;
   int[] A;
   printf("Hello betterC\n");
}

dmd -betterC -run Example_03

Expected result: Failure at compilation stage, owing to presence of dynamic array A, when -betterC set.
Actual result: Failed at link (not compilation) stage.

On Sunday, 8 January 2023 at 13:49:22 UTC, DLearner wrote:

extern(C) void main() {
   import core.stdc.stdio : printf;
   int[] A;
   printf("Hello betterC\n");
}

dmd -betterC -run Example_02

void main() {
   import core.stdc.stdio : printf;
   int[] A;
   printf("Hello betterC\n");
}

dmd -betterC -run Example_03

That example is working for me

What's the exact code you wrote?

On Sunday, 8 January 2023 at 23:59:21 UTC, ryuukk_ wrote:
[...]

void main() {
   import core.stdc.stdio : printf;
   int[] A;
   printf("Hello betterC\n");
}

dmd -betterC -run Example_03

void main() {
   import core.stdc.stdio : printf;
   int[] A;
   printf("Hello betterC\n");
}

Result:

C:\Users\SoftDev\Documents\BDM\D\BetterC>dmd -betterC -run Example_03
lld-link: error: undefined symbol: __d_run_main
>>> referenced by Example_03.obj:(_main)
Error: linker exited with status 1

Compiler version:

C:\Users\SoftDev\Documents\BDM\D\BetterC>dmd --version
DMD32 D Compiler v2.100.2-dirty