gcc/testsuite/gdc.test/fail_compilation/fail3882.d

// REQUIRED_ARGS: -w
// PERMUTE_ARGS: -debug

/******************************************/
// 3882

/*
TEST_OUTPUT:
---
fail_compilation/fail3882.d(23): Warning: calling fail3882.strictlyPure!int.strictlyPure without side effects discards return value of type int, prepend a cast(void) if intentional
fail_compilation/fail3882.d(27): Warning: calling fp without side effects discards return value of type int, prepend a cast(void) if intentional
---
*/

@safe pure nothrow T strictlyPure(T)(T x)
{
    return x*x;
}

void main()
{
    int x = 3;
    strictlyPure(x);

    // 12649
    auto fp = &strictlyPure!int;
    fp(x);
}

/******************************************/
// bugfix in TypeFunction::purityLevel

/*
TEST_OUTPUT:
---
fail_compilation/fail3882.d(46): Warning: calling fail3882.f1 without side effects discards return value of type int, prepend a cast(void) if intentional
fail_compilation/fail3882.d(47): Warning: calling fail3882.f2 without side effects discards return value of type int, prepend a cast(void) if intentional
---
*/

nothrow pure int f1(immutable(int)[] a) { return 0; }
nothrow pure int f2(immutable(int)*  p) { return 0; }

void test_bug()
{
    f1([]);
    f2(null);
}