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Make sure that thunks are restored properly if an exception occurs 

Fixes Hydra bug #67.
This commit is contained in:
Eelco Dolstra 2013-03-14 17:21:13 +01:00
parent 4b07476848
commit c56bc3d81c
1 changed files with 6 additions and 3 deletions
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9
src/libexpr/eval-inline.hh
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@ -21,13 +21,16 @@ LocalNoInlineNoReturn(void throwTypeError(const char * s, const string & s2))
void EvalState::forceValue(Value & v)
{
if (v.type == tThunk) {
ValueType saved = v.type;
Env * env = v.thunk.env;
Expr * expr = v.thunk.expr;
try {
v.type = tBlackhole;
//checkInterrupt();
v.thunk.expr->eval(*this, *v.thunk.env, v);
expr->eval(*this, *env, v);
} catch (Error & e) {
v.type = saved;
v.type = tThunk;
v.thunk.env = env;
v.thunk.expr = expr;
throw;
}
}