[Issue 3020] New: No description is given why function may not be nothrow

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=3020

           Summary: No description is given why function may not be
                    nothrow
           Product: D
           Version: unspecified
          Platform: PC
        OS/Version: Windows
            Status: NEW
          Keywords: diagnostic
          Severity: critical
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla at digitalmars.com
        ReportedBy: 2korden at gmail.com


import std.stdio;

int foo(int i, int j) nothrow
{
    return i + j;
}

int bar() nothrow
{
    return 0;
}

void test() nothrow
{
    int x = bar();
    int y = foo(x, x);
    writefln("%d, %d", x, y);
}

void main()
{
    test();
}

Expected output:
test.d(13): Error: function test.test 'test' is nothrow yet writefln at
test.d(17) may throw

Actual output:
test.d(13): Error: function test.test 'test' is nothrow yet may throw

Rising its severity because the feature is barely usable without appropriate
error messages.

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