Method putExtern

src/main/java/wyil/lang/WyilFile.java:521–536

(Decl.Unit unit)

			}

			public Decl.Unit putExtern(Decl.Unit unit) {
				Tuple<Decl.Unit> externs = getExterns();
				// Check whether replacing unit or adding new
				for (int i = 0; i != externs.size(); ++i) {
					Decl.Unit ith = externs.get(i);
					if (ith.getName().equals(unit.getName())) {
						// We're replacing an existing unit
						externs.setOperand(i, unit);
						return ith;
					}
				}
				// We're adding a new unit
				setOperand(2, getHeap().allocate(externs.append(unit)));
				// Nothing was replaced
				return null;
			}

			public void addAttribute(Syntactic.Marker attribute) {
				setOperand(3, getHeap().allocate(getAttributes().append(attribute)));