[Issue 18590] New: nothrow constructor call still type-checks destructor for purity

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18590

          Issue ID: 18590
           Summary: nothrow constructor call still type-checks destructor
                    for purity
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: code at dawg.eu

cat > bug.d << CODE
extern(C) int printf(const char*, ...);

struct F
{
    static F create() pure nothrow
    {
        return F(1);
    }

    this(int) pure nothrow
    {
    }

    ~this()
    {
        printf("~this\n");
    }
}
CODE
dmd -c bug
----
Error: pure function 'bug.F.create' cannot call impure function 'bug.F.~this'
----

Apparently happens because `F(1)` is lowered to `(tmp = F(1)),tmp` internally.
https://github.com/dlang/dmd/blob/93804714c4091a8d867c09ca7b5bf332acb34dfb/src/dmd/expression.d#L3931

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