Fix: bitwise shift with negative n returns NA

com.oracle.truffle.r.nodes.builtin/src/com/oracle/truffle/r/nodes/builtin/base/BitwiseFunctions.java

@@ -91,14 +91,14 @@ public class BitwiseFunctions {
                             v = aVal ^ bVal;
                             break;
                         case SHIFTR:
-                            if (bVal > 31) {
+                            if (bVal > 31 || bVal < 0) {
                                 v = RRuntime.INT_NA;
                             } else {
                                 v = aVal >>> bVal;
                             }
                             break;
                         case SHIFTL:
-                            if (bVal > 31) {
+                            if (bVal > 31 || bVal < 0) {
                                 v = RRuntime.INT_NA;
                             } else {
                                 v = aVal << bVal;

documentation/graphics.md

@@ -94,3 +94,4 @@ FastR's grid implementation does not yet support:
 
 FastR does not plan to implement the R graphics engine display list
 and related functions. However, the grid display list is implemented.
+