code: static JbcSrcJavaValue of(Expression expr, JbcSrcValueErrorReporter reporter) {
      if (expr instanceof SoyExpression) {
        return new JbcSrcJavaValue(
            expr,
            /* method= */ null,
            /* allowedType= */ ((SoyExpression) expr).soyType(),
            /* constantNull= */ false,
            /* error= */ false,
            reporter);
      }
      return new JbcSrcJavaValue(
          expr,
          /* method= */ null,
          /* allowedType= */ null,
          /* constantNull= */ false,
          /* error= */ false,
          reporter);
    }
docs: Constructs a JbcSrcJavaValue based on the Expression.