1 files changed, 6 insertions, 0 deletions
diff --git a/st/SymbolTable.java b/st/SymbolTable.java
index 90640c6..15d33a0 100644
--- a/st/SymbolTable.java
+++ b/st/SymbolTable.java
@@ -2,6 +2,7 @@ package st;
 
 import java.util.*;
 import misc.*;
+import heat.TypecheckException;
 
 /**
  * Class which provides methods for interacting with and managing
@@ -30,11 +31,16 @@ public class SymbolTable {
 
     /**
      * Methods intended to be used during the first pass
+     *
+     * Will always throw a typecheck error when symbols are not distinct.
      */
     public void put(TokenKey id, AbstractInstance symbol) {
         MinimalLogger.info(String.format("Inserting %s -> %s",
                                          id,
                                          symbol.getType()));
+        if (this.symt.get(id) != null)
+            throw new TypecheckException(String.format("SymbolTable tried to place %s twice!",
+                                                       id.toString()));
         this.symt.put(id, symbol);
     }