Annex C (informative) Compatibility [diff]

[temp.param]
Change: Remove export.

Rationale: No implementation consensus.

Effect on original feature: A valid C++ 2003 declaration containing export is ill-formed in this International Standard.

[temp.arg]
Change: Remove whitespace requirement for nested closing template right angle brackets.

Rationale: Considered a persistent but minor annoyance.

Template aliases representing non-class types would exacerbate whitespace issues.

Effect on original feature: Change to semantics of well-defined expression.

A valid C++ 2003 expression containing a right angle bracket (“>”) followed immediately by another right angle bracket may now be treated as closing two templates.

For example, the following code is valid in C++ 2003 because “>>” is a right-shift operator, but invalid in this International Standard because “>>” closes two templates.

template <class T> struct X { };
template <int N> struct Y { };
X< Y< 1 >> 2 > > x;

[temp.dep.candidate]
Change: Allow dependent calls of functions with internal linkage.

Rationale: Overly constrained, simplify overload resolution rules.

Effect on original feature: A valid C++ 2003 program could get a different result than this International Standard.