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Don't allow arbitrary computations in flake attributes

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E.g. you can write 'edition = 201909' but not 'edition = 201909 + 0'.

Fixes #3075.
This commit is contained in:
Eelco Dolstra 2019-09-09 16:34:44 +02:00
parent 2fa7f2a56a
commit c87840ae14
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3 changed files with 46 additions and 14 deletions
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src/libexpr/eval.hh
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@ -338,6 +338,7 @@ private:
/* Return a string representing the type of the value `v'. */
string showType(ValueType type);
string showType(const Value & v);
/* Decode a context string ‘!<name>!<path>’ into a pair <path,