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| author | Eelco Dolstra <e.dolstra@tudelft.nl> | 2004-03-19T14·45+0000 |
|---|---|---|
| committer | Eelco Dolstra <e.dolstra@tudelft.nl> | 2004-03-19T14·45+0000 |
| commit | 79bb0008ec9afa8d8cee9e6b807a579bcb1c92ab (patch) | |
| tree | c2874f394da9d9de0ce37dc031914ba140afdb58 /src/libexpr/eval.cc | |
| parent | e6253b58cdb6b3836a616821b7f5dc66790ac989 (diff) | |
* `null' is a normal form.
Diffstat (limited to 'src/libexpr/eval.cc')
| -rw-r--r-- | src/libexpr/eval.cc | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc index 335f44baac..7ee157c316 100644 --- a/src/libexpr/eval.cc +++ b/src/libexpr/eval.cc @@ -186,14 +186,17 @@ Expr evalExpr2(EvalState & state, Expr e) ATerm name; /* Normal forms. */ - if (atMatch(m, e) >> "Str" || - atMatch(m, e) >> "Path" || - atMatch(m, e) >> "Uri" || - atMatch(m, e) >> "Int" || - atMatch(m, e) >> "Bool" || - atMatch(m, e) >> "Function" || - atMatch(m, e) >> "Attrs" || - atMatch(m, e) >> "List") + string cons; + if (atMatch(m, e) >> cons && + (cons == "Str" || + cons == "Path" || + cons == "Uri" || + cons == "Null" || + cons == "Int" || + cons == "Bool" || + cons == "Function" || + cons == "Attrs" || + cons == "List")) return e; /* Any encountered variables must be undeclared or primops. */ |