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* Some better error messages.

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This commit is contained in:
Eelco Dolstra 2006-10-23 16:45:19 +00:00
parent 1d694eef4c
commit dd300fb48d
2 changed files with 12 additions and 5 deletions
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13
src/libexpr/primops.cc
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@ -130,12 +130,19 @@ static Expr primDerivationStrict(EvalState & state, const ATermVector & args)
queryAllAttrs(evalExpr(state, args[0]), attrs, true);
/* Figure out the name already (for stack backtraces). */
ATerm posDrvName;
Expr eDrvName = attrs.get(toATerm("name"));
if (!eDrvName)
throw EvalError("required attribute `name' missing");
ATerm posDrvName;
if (!matchAttrRHS(eDrvName, eDrvName, posDrvName)) abort();
string drvName = evalStringNoCtx(state, eDrvName);
string drvName;
try {
drvName = evalStringNoCtx(state, eDrvName);
} catch (Error & e) {
e.addPrefix(format("while evaluating the derivation attribute `name' at %1%:\n")
% showPos(posDrvName));
throw;
}
/* Build the derivation expression by processing the attributes. */
Derivation drv;
@ -190,7 +197,7 @@ static Expr primDerivationStrict(EvalState & state, const ATermVector & args)
}
} catch (Error & e) {
e.addPrefix(format("while processing the derivation attribute `%1%' at %2%:\n")
e.addPrefix(format("while evaluating the derivation attribute `%1%' at %2%:\n")
% key % showPos(pos));
e.addPrefix(format("while instantiating the derivation named `%1%' at %2%:\n")
% drvName % showPos(posDrvName));