News
Two bugs in Compiler testing exercise
Written on 01.06.2023 15:10 by Andreas Zeller
Hi everyone,
We found and fixed two bugs in the current compiler testing assignment. Thanks to Stanimir and Faiq for bringing this up!
1. In the AST_ASSIGNMENTS grammar, the definitions of <Assign> and <AugAssign> are wrong. They should read
'<Assign>': [
'Assign(targets=<nonempty_lhs_expr_list>, value=<expr><type_comment>?)'
] # was value=<Name>
and
'<AugAssign>': [
'AugAssign(target=<lhs_expr>, op=<operator>, value=<expr>)' # was value=<Name>
]
respectively.
2. Also in AST_ASSIGNMENTS, the definition of <lhs_expr> is wrong. It should read
'<lhs_expr>': [ '<lhs_Name>', ... ] # was <Name>
with <lhs_Name> being defined as
'<lhs_Name>': [ 'Name(id=<identifier>, ctx=Store())', ],
These two definitions will enable proper parsing of assignments such as x = 42, and subsequently also with clauses.
We apologize for the confusion. The above changes will make it far easier for you to produce a solution.