Performance issue: top-level field value evaluated twice

[bozaro]

Bug Report

Performance issue: top-level field value evaluated twice.

1. Minimal reproduce step (Required)

kcl run for file:

show = lambda s -> str {
    print("show: ${s}")
    s
}

# `_foo` usage before declaration
foo = _foo

_foo = {
    name: "foo"
    value: show("foo")
}

_bar = {
    name: "bar"
    value: show("bar")
}

# `_bar` usage after declaration
bar = _bar

2. What did you expect to see? (Required)

I expect single show: foo and show: bar lines:

show: foo
show: bar
foo:
  name: foo
  value: foo
bar:
  name: bar
  value: bar

3. What did you see instead (Required)

show: foo
show: foo
show: bar
foo:
  name: foo
  value: foo
bar:
  name: bar
  value: bar

4. What is your KCL components version? (Required)

0.10.9-linux-amd64

[bozaro]

kcl run

_i = {
    _c = 0
}

show = lambda s -> str {
    _c = _i._c
    _i._c = _c + 1
    print("show: ${_c}")
    "${_c}"
}

foo1 = foo
foo2 = foo
foo = {
    name: "foo"
    value: show("foo")
}
foo3 = foo

Output:

show: 0
show: 1
foo1:
  name: foo
  value: '0'
foo2:
  name: foo
  value: '0'
foo:
  name: foo
  value: '1'
foo3:
  name: foo
  value: '0'