If an error occurred in /dev/stdin, don't fopen it
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@ -83,7 +83,7 @@ string source_context(const path& file,
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const string& prefix)
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{
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std::size_t len = end_pos - pos;
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if (! len)
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if (! len || file == path("/dev/stdin"))
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return _("<no source context>");
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assert(len > 0);
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