two missing letters


git-svn-id: https://svn.r-project.org/R/trunk@66564 00db46b3-68df-0310-9c12-caf00c1e9a41
all.equal() for environments and refClasses [safer version of r66496]

git-svn-id: https://svn.r-project.org/R/trunk@66566 00db46b3-68df-0310-9c12-caf00c1e9a41
fix as.environment(list())

git-svn-id: https://svn.r-project.org/R/trunk@66567 00db46b3-68df-0310-9c12-caf00c1e9a41
Refactored some code to make available for yte code interpreter.


git-svn-id: https://svn.r-project.org/R/trunk@66568 00db46b3-68df-0310-9c12-caf00c1e9a41
port from branch (!!)

git-svn-id: https://svn.r-project.org/R/trunk@66570 00db46b3-68df-0310-9c12-caf00c1e9a41
Fix PR#15970, tcltk getting messed up by redefinition of <-.

git-svn-id: https://svn.r-project.org/R/trunk@66571 00db46b3-68df-0310-9c12-caf00c1e9a41
as.list(<empty envir>) |--> list()

git-svn-id: https://svn.r-project.org/R/trunk@66572 00db46b3-68df-0310-9c12-caf00c1e9a41