digitalmars.D.bugs - [Issue 19555] New: Trait to get source location for symbol
- d-bugmail puremagic.com (34/34) Jan 07 2019 https://issues.dlang.org/show_bug.cgi?id=19555
https://issues.dlang.org/show_bug.cgi?id=19555 Issue ID: 19555 Summary: Trait to get source location for symbol Product: D Version: D2 Hardware: x86 OS: Windows Status: NEW Severity: enhancement Priority: P1 Component: dmd Assignee: nobody puremagic.com Reporter: simen.kjaras gmail.com Occasionally, one wants to print an error message regarding a symbol that is not defined in one's own code. An example would be a function that requires its parameter types have a certain attribute: struct Foo {} void fun(T)(T t) { import std.traits : hasUDA; static if (!hasUDA!(T, "a")) { pragma(msg, "Type "~T.stringof~" does not have necessary attribute"); } } unittest { fun(Foo()); } In this case, the best thing the pragma(msg) can do is print the line on which fun was invoked, but the actual issue is on the line where Foo is defined, and it would be beneficial if the error message actually stated this. The exact issue that prompted this suggestion is issue 19554, which does essentially what's happening above - a confusing error message is created because it refers to a problem that is actually in a different location from where its effects occur. --
Jan 07 2019