re-open symbols before read, as they may have changed due to shadowing. Example of code this commit fixes:

before:
	a←10
	{a←⍵ ⋄ a} 20
10
	a
10

now:
	a←10
	{a←⍵ ⋄ a} 20
20
	a
10

1 files changed, 2 insertions, 0 deletions

diff --git a/eval.c b/eval.c
index 2e9a78e..bacd724 100644
--- a/eval.c
+++ b/eval.c
@@ -136,6 +136,8 @@ Datum *
 lookup(Datum var)
 {
 	traceprint("VAR LOOKUP %S\n", var.symbol->name);
+	/* re-assign the symbol, since it may have been changed by shadowing */
+	var.symbol = getsym(var.symbol->name, 0);
 
 	if(var.symbol->undefined){
 		Rune *msg = runesmprint("Undefined name: %S", var.symbol->name);