lambda impl

[litlighilit]

In short, lambda with arguments must be implemented via rewrite.

Following are some cases' analysis

assign to a var

Shall register lhs to generate proc definition ahead.

(as lambda proc in Nim cannot be generics)

used in place (in function call)

Some AST dump:

>>> import macros
>>> dumptree:
...   f(lambda a: 1)
... 
StmtList
  ObjConstr
    Ident "f"
    ExprColonExpr
      Command
        Ident "lambda"
        Ident "a"
      IntLit 1
>>> dumptree:
...   f(lambda a, b: 1)
... 
StmtList
  Call
    Ident "f"
    Command
      Ident "lambda"
      Ident "a"
    ExprColonExpr
      Ident "b"
      IntLit 1
>>> dumptree: f(lambda a, b: 1,  3)
StmtList
  Call
    Ident "f"
    Command
      Ident "lambda"
      Ident "a"
    ExprColonExpr
      Ident "b"
      IntLit 1
    IntLit 3
>>> dumptree: f(lambda a, b, c: 1)
StmtList
  Call
    Ident "f"
    Command
      Ident "lambda"
      Ident "a"
    Ident "b"
    ExprColonExpr
      Ident "c"
      IntLit 1
>>> dumptree: f(lambda a, b, *c: 1)
StmtList
  Call
    Ident "f"
    Command
      Ident "lambda"
      Ident "a"
    Ident "b"
    ExprColonExpr
      Prefix
        Ident "*"
        Ident "c"
      IntLit 1
>>> 

[litlighilit]

This rewrite is not very simple as common.

Its priority is a little low.

Above is left as a memo.