Merged 4/11
DoVarDecl fix1
aa
sto.setType(t)
Merge remote-tracking branch 'origin/david' into zhu

Conflicts:
	CSE131_PA1/check1.rc
	CSE131_PA1/src/parser.java
	CSE131_PA1/src/sym.java
f
settype
BinaryExpr
wa
error check
4/12 ready to test error message in DoBinaryOp()
4/12 ready to test error message
Merge remote-tracking branch 'origin/zhu' into david

Conflicts:
	CSE131_PA1/check1.rc
Revert "4/12 ready to test error message"

This reverts commit 6425b2eca1b0368bf894949fe988f1f0fc6a80ef.
4/12 shit happened