https://bugs.llvm.org/show_bug.cgi?id=52395
Bug ID: 52395
Summary: [C++20] [Module] Disallow re-export a declaration
which is declared already
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: C++2a
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
According to https://eel.is/c++draft/module.interface#6, the example shouldn't
be compiled:
```
export module M;
struct S { int n; };
typedef S S;
export typedef S S; // OK, does not redeclare an entity
export struct S; // error: exported declaration follows
non-exported // declaration
```
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