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use singleton expr to generate black hole errors

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this also reduces forceValue code size and removes the need for
hideInDiagnostics. coopting thunk forcing like this has the additional
benefit of clarifying how these errors can happen in the first place.
This commit is contained in:
pennae 2023-12-11 16:23:08 +01:00
parent f9db4de0f3
commit 2b0e95e7aa
8 changed files with 51 additions and 61 deletions
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10
src/libexpr/nixexpr.hh
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@ -462,6 +462,16 @@ struct ExprPos : Expr
COMMON_METHODS
};
/* only used to mark thunks as black holes. */
struct ExprBlackHole : Expr
{
void show(const SymbolTable & symbols, std::ostream & str) const override {}
void eval(EvalState & state, Env & env, Value & v) override;
void bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env) override {}
};
extern ExprBlackHole eBlackHole;
/* Static environments are used to map variable names onto (level,
displacement) pairs used to obtain the value of the variable at