Style cleanup: avoid naming newtype branch constructors (TPyStmt,
TPyExpr, TBlockStmt, TPattern, TBoolExprPair, TScope) outside the
char-preds that classify their wrappers. Method bodies and helper
predicates now use the as* projections instead:
// Before: result = TBlockStmt(ifStmt.getBody())
// After: result.asStmtList() = ifStmt.getBody()
// Before: result = TPyStmt(matchStmt.getCase(index))
// After: result.asStmt() = matchStmt.getCase(index)
Adds:
- AstNode.asStmtList() - the inverse of TBlockStmt(_).
- BinaryExpr.getIndex() - exposes the synthetic-pair index, used
internally by getRightOperand to find the next pair without
naming TBoolExprPair.
No behaviour change: all 24 NewCfg evaluation-order tests pass; all
11 shared-CFG consistency queries report 0 violations on CPython.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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