[2.063] Fix for issue 3449 causes very unclear error messages

[dlangBugzillaToGithub]

Jacob Carlborg (@jacob-carlborg) reported this on 2013-05-24T00:41:09Z

Transferred from https://issues.dlang.org/show_bug.cgi?id=10159

Description

Except that the fix for issue 3449 causes existing code to silently change behavior. It can also cause very unclear and confusing error messages. I hit a couple of these when trying to compile Tango.

Example of error messages I got:

* tango/io/selector/SelectSelector.d(156): Error: function tango.io.selector.SelectSelector.HandleSet.opAssign is not callable because it is annotated with @disable

https://github.com/SiegeLord/Tango-D2/blob/d2port/tango/io/selector/SelectSelector.d#L156

The code doesn't use @disable at all. "opAssign" is not overloaded. It's very confusing that keywords and functions that don't exist in the source code are mentioned.

* Error: cannot modify struct this HandleSet with immutable members

No file or line information.

[dlangBugzillaToGithub]

k.hara.pg commented on 2013-05-24T01:17:08Z

(In reply to comment #0)
> * Error: cannot modify struct this HandleSet with immutable members
> 
> No file or line information.

I opened bug 10160 to fix the strange error message.