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* Functions are incomparable.

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This commit is contained in:
Eelco Dolstra 2010-04-01 10:55:36 +00:00
parent 71f026292b
commit 95cc417d76
1 changed files with 13 additions and 6 deletions
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19
src/libexpr/eval.cc
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@ -69,16 +69,17 @@ std::ostream & operator << (std::ostream & str, Value & v)
string showType(Value & v) string showType(Value & v)
{ {
switch (v.type) { switch (v.type) {
case tString: return "a string";
case tPath: return "a path";
case tNull: return "null";
case tInt: return "an integer"; case tInt: return "an integer";
case tBool: return "a boolean"; case tBool: return "a boolean";
case tLambda: return "a function"; case tString: return "a string";
case tPath: return "a path";
case tAttrs: return "an attribute set"; case tAttrs: return "an attribute set";
case tList: return "a list"; case tList: return "a list";
case tNull: return "null";
case tLambda: return "a function";
case tPrimOp: return "a built-in function";
case tPrimOpApp: return "a partially applied built-in function"; case tPrimOpApp: return "a partially applied built-in function";
default: throw Error("unknown type"); default: throw Error(format("unknown type: %1%") % v.type);
} }
} }
@ -299,7 +300,7 @@ void EvalState::eval(Env & env, Expr e, Value & v)
char x; char x;
if (&x < deepestStack) deepestStack = &x; if (&x < deepestStack) deepestStack = &x;
debug(format("eval: %1%") % e); //debug(format("eval: %1%") % e);
nrEvaluated++; nrEvaluated++;
@ -864,6 +865,12 @@ bool EvalState::eqValues(Value & v1, Value & v2)
return true; return true;
} }
/* Functions are incomparable. */
case tLambda:
case tPrimOp:
case tPrimOpApp:
return false;
default: default:
throw Error(format("cannot compare %1% with %2%") % showType(v1) % showType(v2)); throw Error(format("cannot compare %1% with %2%") % showType(v1) % showType(v2));
} }