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* Print a better error message when a non-derivation attribute set is

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coerced to a string.
This commit is contained in:
Eelco Dolstra 2008-07-24 14:52:25 +00:00
parent 096198d11f
commit fc691e1cbd
1 changed files with 10 additions and 3 deletions
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13
src/libexpr/eval.cc
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@ -48,6 +48,11 @@ LocalNoInlineNoReturn(void throwEvalError(const char * s, const string & s2))
throw EvalError(format(s) % s2);
}
LocalNoInlineNoReturn(void throwTypeError(const char * s))
{
throw TypeError(s);
}
LocalNoInlineNoReturn(void throwTypeError(const char * s, const string & s2))
{
throw TypeError(format(s) % s2);
@ -305,9 +310,11 @@ string coerceToString(EvalState & state, Expr e, PathSet & context,
}
ATermList es;
if (matchAttrs(e, es))
return coerceToString(state, makeSelect(e, toATerm("outPath")),
context, coerceMore, copyToStore);
if (matchAttrs(e, es)) {
Expr e2 = queryAttr(e, "outPath");
if (!e2) throwTypeError("cannot coerce an attribute set (except a derivation) to a string");
return coerceToString(state, e2, context, coerceMore, copyToStore);
}
if (coerceMore) {