Wrap only IOException to RuntimeException. Leave other exceptions untouched.

com.oracle.truffle.r.nodes.builtin/src/com/oracle/truffle/r/nodes/builtin/fastr/FastRInterop.java

@@ -22,6 +22,8 @@
  */
 package com.oracle.truffle.r.nodes.builtin.fastr;
 
+import java.io.IOException;
+
 import com.oracle.truffle.api.CallTarget;
 import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
 import com.oracle.truffle.api.dsl.Specialization;
@@ -51,14 +53,16 @@ public class FastRInterop {
 
             try {
                 callTarget = RContext.getInstance().getEnv().parse(sourceObject);
-            } catch (RuntimeException e) {
-                throw e;
-            } catch (Exception e) {
+                emitIO();
+            } catch (IOException e) {
                 throw new RuntimeException(e);
             }
 
             return callTarget.call();
         }
+
+        private void emitIO() throws IOException {
+        }
     }
 
     @RBuiltin(name = ".fastr.interop.export", visibility = RVisibility.OFF, kind = RBuiltinKind.PRIMITIVE, parameterNames = {"name", "value"})