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[module.unit]p1 specifies that module and import are invalid components of a module name, that module names cannot contain reserved identifiers, and that std followed by zero or more digits is reserved. The first issue (module and import pseudo-keywords) requires a diagnostic, the second issue (use of reserved identifiers) does not require a diagnostic. We diagnose both the same -- the code is ill- formed unless the module declaration is in a system "header". This allows STL implementations to use the reserved module names while preventing users from stealing them out from under us. Differential Revision: https://reviews.llvm.org/D136953
46 lines
3.4 KiB
C++
46 lines
3.4 KiB
C++
// RUN: %clang_cc1 -std=c++20 -fsyntax-only -verify %s
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// expected-note@1 15{{add 'module;' to the start of the file to introduce a global module fragment}}
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module std; // expected-error {{'std' is a reserved name for a module}}
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module _Test; // expected-error {{'_Test' is a reserved name for a module}} \
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expected-error {{module declaration must occur at the start of the translation unit}}
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module module; // expected-error {{'module' is an invalid name for a module}} \
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expected-error {{module declaration must occur at the start of the translation unit}}
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module std0; // expected-error {{'std0' is a reserved name for a module}} \
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expected-error {{module declaration must occur at the start of the translation unit}}
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export module module; // expected-error {{'module' is an invalid name for a module}} \
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expected-error {{module declaration must occur at the start of the translation unit}}
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export module import; // expected-error {{'import' is an invalid name for a module}} \
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expected-error {{module declaration must occur at the start of the translation unit}}
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export module _Test; // expected-error {{'_Test' is a reserved name for a module}} \
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expected-error {{module declaration must occur at the start of the translation unit}}
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export module __test; // expected-error {{'__test' is a reserved name for a module}} \
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expected-error {{module declaration must occur at the start of the translation unit}}
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export module te__st; // expected-error {{'te__st' is a reserved name for a module}} \
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expected-error {{module declaration must occur at the start of the translation unit}}
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export module std; // expected-error {{'std' is a reserved name for a module}} \
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expected-error {{module declaration must occur at the start of the translation unit}}
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export module std.foo;// expected-error {{'std' is a reserved name for a module}} \
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expected-error {{module declaration must occur at the start of the translation unit}}
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export module std0; // expected-error {{'std0' is a reserved name for a module}} \
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expected-error {{module declaration must occur at the start of the translation unit}}
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export module std1000000; // expected-error {{'std1000000' is a reserved name for a module}} \
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expected-error {{module declaration must occur at the start of the translation unit}}
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export module should_fail._Test; // expected-error {{'_Test' is a reserved name for a module}} \
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expected-error {{module declaration must occur at the start of the translation unit}}
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// Show that being in a system header doesn't save you from diagnostics about
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// use of an invalid module-name identifier.
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# 34 "reserved-names-1.cpp" 1 3
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export module module; // expected-error {{'module' is an invalid name for a module}} \
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expected-error {{module declaration must occur at the start of the translation unit}}
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export module _Test.import; // expected-error {{'import' is an invalid name for a module}} \
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expected-error {{module declaration must occur at the start of the translation unit}}
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# 39 "reserved-names-1.cpp" 2 3
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// We can still use a reserved name on imoport.
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import std; // expected-error {{module 'std' not found}}
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