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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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6
src/libexpr/primops.hh
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@ -51,10 +51,4 @@ void prim_importNative(EvalState & state, const PosIdx pos, Value * * args, Valu
*/
void prim_exec(EvalState & state, const PosIdx pos, Value * * args, Value & v);
/**
* Placeholder value for black holes, used to represent black holes as
* applications of this value to the evaluated thunks.
*/
extern Value prim_blackHole;
}