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

/*
TEST_OUTPUT:
---
fail_compilation/testInference.d(24): Error: cannot implicitly convert expression `this.a` of type `inout(A8998)` to `immutable(A8998)`
---
*/

class A8998
{
    int i;
}
class C8998
{
    A8998 a;

    this()
    {
        a = new A8998();
    }

    // WRONG: Returns immutable(A8998)
    immutable(A8998) get() inout pure
    {
        return a;   // should be error
    }
}

/*
TEST_OUTPUT:
---
fail_compilation/testInference.d(39): Error: cannot implicitly convert expression `s` of type `const(char[])` to `string`
fail_compilation/testInference.d(44): Error: cannot implicitly convert expression `a` of type `int[]` to `immutable(int[])`
fail_compilation/testInference.d(49): Error: cannot implicitly convert expression `a` of type `int[]` to `immutable(int[])`
fail_compilation/testInference.d(54): Error: cannot implicitly convert expression `a` of type `int[]` to `immutable(int[])`
---
*/
string foo(in char[] s) pure
{
    return s;   //
}
immutable(int[]) x1() /*pure*/
{
    int[] a = new int[](10);
    return a;   //
}
immutable(int[]) x2(int len) /*pure*/
{
    int[] a = new int[](len);
    return a;
}
immutable(int[]) x3(immutable(int[]) org) /*pure*/
{
    int[] a = new int[](org.length);
    return a;   //
}


/*
TEST_OUTPUT:
---
fail_compilation/testInference.d(94): Error: cannot implicitly convert expression `c` of type `testInference.C1` to `immutable(C1)`
fail_compilation/testInference.d(95): Error: cannot implicitly convert expression `c` of type `testInference.C1` to `immutable(C1)`
fail_compilation/testInference.d(96): Error: cannot implicitly convert expression `c` of type `testInference.C3` to `immutable(C3)`
fail_compilation/testInference.d(97): Error: cannot implicitly convert expression `c` of type `testInference.C3` to `immutable(C3)`
fail_compilation/testInference.d(100): Error: undefined identifier `X1`, did you mean function `x1`?
fail_compilation/testInference.d(106): Error: cannot implicitly convert expression `s` of type `S1` to `immutable(S1)`
fail_compilation/testInference.d(109): Error: cannot implicitly convert expression `a` of type `int*[]` to `immutable(int*[])`
fail_compilation/testInference.d(110): Error: cannot implicitly convert expression `a` of type `const(int)*[]` to `immutable(int*[])`
fail_compilation/testInference.d(114): Error: cannot implicitly convert expression `s` of type `S2` to `immutable(S2)`
fail_compilation/testInference.d(115): Error: cannot implicitly convert expression `s` of type `S2` to `immutable(S2)`
fail_compilation/testInference.d(116): Error: cannot implicitly convert expression `s` of type `S2` to `immutable(S2)`
fail_compilation/testInference.d(118): Error: cannot implicitly convert expression `a` of type `const(int)*[]` to `immutable(int*[])`
---
*/
immutable(Object) get(inout int*) pure
{
    auto o = new Object;
    return o;   // should be ok
}
immutable(Object) get(immutable Object) pure
{
    auto o = new Object;
    return o;   // should be ok
}
inout(Object) get(inout Object) pure
{
    auto o = new Object;
    return o;   // should be ok (, but cannot in current conservative rule)
}

class C1 { C2 c2; }
class C2 { C3 c3; }
class C3 { C1 c1; }
immutable(C1) recursive1(C3 pc) pure { auto c = new C1(); return c; }   // should be error, because pc.c1 == C1
immutable(C1) recursive2(C2 pc) pure { auto c = new C1(); return c; }   // should be error, because pc.c3.c1 == C1
immutable(C3) recursive3(C1 pc) pure { auto c = new C3(); return c; }   // should be error, c.c1 may be pc
immutable(C3) recursive4(C2 pc) pure { auto c = new C3(); return c; }   // should be error, c.c1.c2 may be pc
immutable(C1) recursive5(shared C2 pc) pure { auto c = new C1(); return c; }
immutable(C1) recursive6(immutable C2 pc) pure { auto c = new C1(); return c; }
immutable(C1) recursiveE(immutable C2 pc) pure { auto c = new X1(); return c; }

class C4 { C4[] arr; }
immutable(C4)[] recursive7(int[] arr) pure { auto a = new C4[](1); return a; }

struct S1 { int* ptr; }
immutable(S1)     foo1a(          int*[] prm) pure {                S1 s; return s; }   // NG
immutable(S1)     foo1b(    const int*[] prm) pure {                S1 s; return s; }   // OK
immutable(S1)     foo1c(immutable int*[] prm) pure {                S1 s; return s; }   // OK
immutable(int*[]) bar1a(              S1 prm) pure {           int *[] a; return a; }   // NG
immutable(int*[]) bar1b(              S1 prm) pure {     const(int)*[] a; return a; }   // NG
immutable(int*[]) bar1c(              S1 prm) pure { immutable(int)*[] a; return a; }   // OK

struct S2 { const(int)* ptr; }
immutable(S2)     foo2a(          int*[] prm) pure {                S2 s; return s; }   // OK
immutable(S2)     foo2b(    const int*[] prm) pure {                S2 s; return s; }   // NG
immutable(S2)     foo2c(immutable int*[] prm) pure {                S2 s; return s; }   // NG
immutable(int*[]) bar2a(              S2 prm) pure {           int *[] a; return a; }   // OK
immutable(int*[]) bar2b(              S2 prm) pure {     const(int)*[] a; return a; }   // NG
immutable(int*[]) bar2c(              S2 prm) pure { immutable(int)*[] a; return a; }   // OK


/*
TEST_OUTPUT:
---
fail_compilation/testInference.d(134): Error: cannot implicitly convert expression `f10063(cast(inout(void*))p)` of type `inout(void)*` to `immutable(void)*`
---
*/
inout(void)* f10063(inout void* p) pure
{
    return p;
}
immutable(void)* g10063(inout int* p) pure
{
    return f10063(p);
}

/*
TEST_OUTPUT:
---
fail_compilation/testInference.d(154): Error: pure function 'testInference.bar14049' cannot call impure function 'testInference.foo14049!int.foo14049'
---
*/
auto impure14049() { static int i = 1; return i; }

void foo14049(T)(T val)
{
    auto n = () @trusted {
        return impure14049();
    }();
}

void bar14049() pure
{
    foo14049(1);
}

/*
TEST_OUTPUT:
---
fail_compilation/testInference.d(166): Error: pure function 'testInference.f14160' cannot access mutable static data 'g14160'
---
*/
int g14160;
int* f14160() pure
{
    return &g14160; // should be rejected
}

/*
TEST_OUTPUT:
---
fail_compilation/testInference.d(180): Error: pure function 'testInference.test12422' cannot call impure function 'testInference.test12422.bar12422!().bar12422'
---
*/
int g12422;
void foo12422() { ++g12422; }
void test12422() pure
{
    void bar12422()() { foo12422(); }
    bar12422();
}

/*
TEST_OUTPUT:
---
fail_compilation/testInference.d(196): Error: pure function 'testInference.test13729a' cannot access mutable static data 'g13729'
fail_compilation/testInference.d(206): Error: pure function 'testInference.test13729b' cannot call impure function 'testInference.test13729b.foo!().foo'
---
*/
int g13729;

void test13729a() pure
{
    static void foo()   // typed as impure
    {
        g13729++;       // disallowed
    }
    foo();
}
void test13729b() pure
{
    static void foo()() // inferred to impure
    {
        g13729++;
    }
    foo();              // cannot call impure function
}

/*
TEST_OUTPUT:
---
fail_compilation/testInference.d(225): Error: testInference.test17086 called with argument types (bool) matches both:
fail_compilation/testInference.d(219):     testInference.test17086!(bool, false).test17086(bool x)
and:
fail_compilation/testInference.d(220):     testInference.test17086!(bool, false).test17086(bool y)
---
*/

void test17086 (T, T V = T.init) (T x) { assert(x.foo); }
void test17086 (T, T V = T.init) (T y) { assert(y.bar); }

void test17086_call ()
{
    bool f;
    test17086(f);
}