gcc/testsuite/gdc.test/fail_compilation/fail176.d

/*
TEST_OUTPUT:
---
fail_compilation/fail176.d(13): Error: cannot modify immutable expression a[1]
fail_compilation/fail176.d(16): Error: cannot modify immutable expression b[1]
fail_compilation/fail176.d(19): Error: cannot modify const expression c[1]
---
*/

void foo()
{
    auto a = "abc";
    a[1] = 'd';

    immutable char[3] b = "abc";
    b[1] = 'd';

    const char[3] c = "abc";
    c[1] = 'd';
}