https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105672
Bug ID: 105672
Summary: Print note when unable to convert between types with
the same name but different scopes
Product: gcc
Version: 12.1.1
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
Target Milestone: ---
I spent far too long confused by this error:
vt.C:276:15: error: conversion from 'std::tuple<int, double,
std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >
>' to non-scalar type 'tuple<int, float, std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > >' requested
276 | make_tuple(17, 2.718281828, std::string("Fun"));
| ~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The problem is that one type is std::tuple<...> and the other is ::tuple<...>
but the distinction is not very obvious in the error.
Could we add a note for ill-formed conversions between two types that have the
same name, to make it more obvious that they're defined in different scopes?
Maybe:
<error loc>:<col>: note: tuple and std::tuple are not the same type
<decl1 loc>:<col>: note: tuple define here
<decl2 loc>:<col>: note: std::tuple define here
