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Show function names in error messages

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Functions in Nix are anonymous, but if they're assigned to a
variable/attribute, we can use the variable/attribute name in error
messages, e.g.

while evaluating `concatMapStrings' at `/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/pkgs/lib/strings.nix:18:25':
...
This commit is contained in:
Eelco Dolstra 2013-05-16 19:08:02 +02:00
parent 1b3a03f161
commit 18a48d80a0
5 changed files with 43 additions and 8 deletions
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4
src/libexpr/nixexpr.hh
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@ -63,6 +63,7 @@ struct Expr
virtual void bindVars(const StaticEnv & env);
virtual void eval(EvalState & state, Env & env, Value & v);
virtual Value * maybeThunk(EvalState & state, Env & env);
virtual void setName(Symbol & name);
};
std::ostream & operator << (std::ostream & str, Expr & e);
@ -197,6 +198,7 @@ struct Formals
struct ExprLambda : Expr
{
Pos pos;
Symbol name;
Symbol arg;
bool matchAttrs;
Formals * formals;
@ -208,6 +210,8 @@ struct ExprLambda : Expr
throw ParseError(format("duplicate formal function argument `%1%' at %2%")
% arg % pos);
};
void setName(Symbol & name);
string showNamePos();
COMMON_METHODS
};