And lhs, rhs must be Pattern, can't be node literal, means TryGetMatchFun(m, l or r) != nil.

Any subtree node matched pattern.

Bind match node to variable, so can be retrieved from env in callback's arg.

BuiltinCallee match fun exactly.

BuiltinCalleeOf a builtin function call.

CalleeOf a builtin / function / method / var call.

FuncCallee match pkg.fun exactly.

FuncOrMethodCalleeOf a function or method call, exclude builtin and var call.

IdentRecvTypeOf for ast.FuncDecl { Name }.

IfaceCallee match pkg.iface.method exactly.

MethodCallee match pkg.typ.method exactly addressable means whether the receiver is addressable.

Nil literal represents wildcard[T] for convenient, so a special Nil pattern needed.

Not a must be Pattern, can't be node literal, means TryGetMatchFun(m, a) != nil.

ObjectOf notice: can't be used for `f` or `a.b` in `f[T]()` `a.b[T]()` unpacking index/indexList is needed firstly please use XXX CalleeOf.

Or lhs, rhs must be Pattern, can't be node literal, means TryGetMatchFun(m, l or r) != nil.

SelectorPkgOf Assume X is ident.

SelectorTypeOf e.g., struct{x int}.x so can't use IdentObjectOf.

StaticCalleeOf a static function (or method) call, exclude var / builtin call.

VarCalleeOf a var call.

Wildcard is a pattern that matches any node.