.. include:: ../reusables/abstract-syntax-tree.rst

An ``IDENTIFIER`` should match the regular expression ``/[a-zA-Z_][a-zA-Z0-9_]*/``. A ``CNAME`` should match ``/[A-Z][a-zA-Z0-9_]*/``.

``TERM`` is either a semicolon or a newline used to terminate a statement.

Statement classes

| CNAME | ConstantReadAccess_ | ConstantAccess_ | |

| CNAME ``=`` Expr_ | ConstantAssignment_ | ConstantWriteAccess_ | |

| ``:foo`` | SymbolLiteral_ | StringlikeLiteral_ | |

Modules and Ruby classes

All classes in this subsection are subclasses of BodyStmt_ and Scope_.

| Expression syntax | CodeQL class | Superclasses | Remarks |

| ``class`` CNAME [``<`` Expr_] TERM StmtSequence_ TERM ``end`` | ClassDeclaration_ | Namespace_, ConstantWriteAccess_ | |

| ``module`` CNAME TERM StmtSequence_ TERM ``end`` | ModuleDeclaration_ | Namespace_, ConstantWriteAccess_ | |

| ``class <<`` Expr_ TERM StmtSequence_ TERM ``end`` | SingletonClass_ | ModuleBase_ | |

Method classes

| ``(`` StmtSequence_ ``)`` | ParenthesizedExpr_ | StmtSequence_ | |

| ``rescue`` TODO | RescueClause_ | Expr_ | |

| Stmt_ ``rescue`` Stmt_ | RescueModifierExpr_ | Expr_ | |

| StmtSequence_ TERM Stmt_ | StmtSequence_ | Expr_ | A sequence of 0 or more statements, separated by semicolons or newlines |

| StringLiteral_ StringLiteral_ | StringConcatenation_ | Expr_ | Implicit concatenation of consecutive string literals |

| | BlockParameter_ | | |