Fixes exists? to work with modules

interpreter.go

@@ -501,7 +501,24 @@ func eval(exp expression, en *env) (value expression) {
 				if ok {
 					_, err = en.Find(symbol(String(eval(e[i+1], en), false)))
 				} else {
-					_, err = en.Find(symbol(String(e[i+1], false)))
+					environ := en
+					symbolAsString := String(e[i+1], false)
+					if i := strings.Index(symbolAsString, "::"); i >= 0 {
+						modname := symbolAsString[:i]
+						alias, ok := altnamespaces[modname]
+						if !ok {
+							e, ok2 := namespaces[modname]
+							if !ok2 {
+								return false
+							}
+							environ = &e
+						} else {
+							e := namespaces[alias]
+							environ = &e
+						}
+						symbolAsString = symbolAsString[i+2:]
+					}
+					_, err = environ.Find(symbol(symbolAsString))
 				}
 				if doPanic {
 					panicOnException = true

main.go

@@ -18,7 +18,7 @@ import (
 	ln "github.com/peterh/liner"
 )
 
-const version = "1.2.10"
+const version = "1.2.11"
 
 const globalLibPath = "/usr/local/lib/slope/modules/"