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authorEelco Dolstra <e.dolstra@tudelft.nl>2003-11-01T19·10+0000
committerEelco Dolstra <e.dolstra@tudelft.nl>2003-11-01T19·10+0000
commit1b4184ccbb01634792897d3412c489b989674567 (patch)
tree5284cac6187211341c82fb440cc941f776ab46e9 /src/fix-ng/eval.cc
parenta2a9bacd8296ed1ddb6105b649a062fe65c27759 (diff)
* Let syntax.
Diffstat (limited to 'src/fix-ng/eval.cc')
-rw-r--r--src/fix-ng/eval.cc5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/fix-ng/eval.cc b/src/fix-ng/eval.cc
index 785467741631..46bb1f94188d 100644
--- a/src/fix-ng/eval.cc
+++ b/src/fix-ng/eval.cc
@@ -160,6 +160,11 @@ Expr evalExpr2(EvalState & state, Expr e)
     if (ATmatch(e, "Rec([<list>])", &bnds))
         return expandRec(e, (ATermList) bnds);
 
+    /* Let expressions `let {..., body = ...}' are just desugared
+       into `(rec {..., body = ...}).body'. */
+    if (ATmatch(e, "LetRec(<term>)", &e1))
+        return evalExpr(state, ATmake("Select(Rec(<term>), \"body\")", e1));
+
     /* Barf. */
     throw badTerm("invalid expression", e);
 }