hierarchy: improve error message
* spot/tl/hierarchy.cc (mp_class): Fix type of o so that it is displayed as an character in error messages.
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@ -312,7 +312,7 @@ namespace spot
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bool wide = false;
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bool wide = false;
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if (opt)
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if (opt)
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for (;;)
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for (;;)
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switch (int o = *opt++)
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switch (char o = *opt++)
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{
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{
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case 'v':
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case 'v':
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verbose = true;
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verbose = true;
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