Bug 9217 – A problem with default function argument initialization

import std.bigint; void foo1(BigInt x = 0) {} // Error void foo2(BigInt y = "1") {} // Error void main() { BigInt x = 0; // OK BigInt y = "1"; // OK } DMD 2.061alpha gives: test.d(2): Error: cannot implicitly convert expression (0) of type int to BigInt test.d(3): Error: cannot implicitly convert expression ("1") of type string to BigInt Workaround: import std.bigint; void foo1(BigInt x = BigInt(0)) {} // OK void foo2(BigInt y = BigInt("1")) {} // OK void main() { BigInt x = 0; // OK BigInt y = "1"; // OK } This problem in some cases asks me long function signatures as workarounds. I can't write: void foo(Ptr!(immutable(int[10])) arr=null) {...} I have to define a Ptr!(...) helper alias elsewhere, or to write this: void foo(Ptr!(immutable(int[10])) arr=Ptr!(immutable(int[10])).init) {...}

*** This issue has been marked as a duplicate of issue 7019 ***