1" Test various aspects of the Vim9 script language.
2
3source check.vim
4source view_util.vim
5source vim9.vim
6
7func Test_def_basic()
8  def SomeFunc(): string
9    return 'yes'
10  enddef
11  call assert_equal('yes', SomeFunc())
12endfunc
13
14def ReturnString(): string
15  return 'string'
16enddef
17
18def ReturnNumber(): number
19  return 123
20enddef
21
22let g:notNumber = 'string'
23
24def ReturnGlobal(): number
25  return g:notNumber
26enddef
27
28def Test_return_something()
29  assert_equal('string', ReturnString())
30  assert_equal(123, ReturnNumber())
31  assert_fails('call ReturnGlobal()', 'E1029: Expected number but got string')
32enddef
33
34let s:nothing = 0
35def ReturnNothing()
36  s:nothing = 1
37  if true
38    return
39  endif
40  s:nothing = 2
41enddef
42
43def Test_return_nothing()
44  ReturnNothing()
45  assert_equal(1, s:nothing)
46enddef
47
48func Increment()
49  let g:counter += 1
50endfunc
51
52def Test_call_ufunc_count()
53  g:counter = 1
54  Increment()
55  Increment()
56  Increment()
57  " works with and without :call
58  assert_equal(4, g:counter)
59  call assert_equal(4, g:counter)
60  unlet g:counter
61enddef
62
63def MyVarargs(arg: string, ...rest: list<string>): string
64  let res = arg
65  for s in rest
66    res ..= ',' .. s
67  endfor
68  return res
69enddef
70
71def Test_call_varargs()
72  assert_equal('one', MyVarargs('one'))
73  assert_equal('one,two', MyVarargs('one', 'two'))
74  assert_equal('one,two,three', MyVarargs('one', 'two', 'three'))
75enddef
76
77def MyDefaultArgs(name = 'string'): string
78  return name
79enddef
80
81def Test_call_default_args()
82  assert_equal('string', MyDefaultArgs())
83  assert_equal('one', MyDefaultArgs('one'))
84  assert_fails('call MyDefaultArgs("one", "two")', 'E118:')
85
86  CheckScriptFailure(['def Func(arg: number = asdf)', 'enddef'], 'E1001:')
87  CheckScriptFailure(['def Func(arg: number = "text")', 'enddef'], 'E1013: argument 1: type mismatch, expected number but got string')
88enddef
89
90def Test_nested_function()
91  def Nested(arg: string): string
92    return 'nested ' .. arg
93  enddef
94  assert_equal('nested function', Nested('function'))
95
96  CheckDefFailure(['def Nested()', 'enddef', 'Nested(66)'], 'E118:')
97  CheckDefFailure(['def Nested(arg: string)', 'enddef', 'Nested()'], 'E119:')
98
99  CheckDefFailure(['func Nested()', 'endfunc'], 'E1086:')
100enddef
101
102func Test_call_default_args_from_func()
103  call assert_equal('string', MyDefaultArgs())
104  call assert_equal('one', MyDefaultArgs('one'))
105  call assert_fails('call MyDefaultArgs("one", "two")', 'E118:')
106endfunc
107
108func TakesOneArg(arg)
109  echo a:arg
110endfunc
111
112def Test_call_wrong_args()
113  call CheckDefFailure(['TakesOneArg()'], 'E119:')
114  call CheckDefFailure(['TakesOneArg(11, 22)'], 'E118:')
115  call CheckDefFailure(['bufnr(xxx)'], 'E1001:')
116  call CheckScriptFailure(['def Func(Ref: func(s: string))'], 'E475:')
117enddef
118
119" Default arg and varargs
120def MyDefVarargs(one: string, two = 'foo', ...rest: list<string>): string
121  let res = one .. ',' .. two
122  for s in rest
123    res ..= ',' .. s
124  endfor
125  return res
126enddef
127
128def Test_call_def_varargs()
129  call assert_fails('call MyDefVarargs()', 'E119:')
130  assert_equal('one,foo', MyDefVarargs('one'))
131  assert_equal('one,two', MyDefVarargs('one', 'two'))
132  assert_equal('one,two,three', MyDefVarargs('one', 'two', 'three'))
133  call CheckDefFailure(['MyDefVarargs("one", 22)'], 'E1013: argument 2: type mismatch, expected string but got number')
134enddef
135
136let s:value = ''
137
138def FuncOneDefArg(opt = 'text')
139  s:value = opt
140enddef
141
142def FuncTwoDefArg(nr = 123, opt = 'text'): string
143  return nr .. opt
144enddef
145
146def FuncVarargs(...arg: list<string>): string
147  return join(arg, ',')
148enddef
149
150def Test_func_type_varargs()
151  let RefDefArg: func(?string)
152  RefDefArg = FuncOneDefArg
153  RefDefArg()
154  assert_equal('text', s:value)
155  RefDefArg('some')
156  assert_equal('some', s:value)
157
158  let RefDef2Arg: func(?number, ?string): string
159  RefDef2Arg = FuncTwoDefArg
160  assert_equal('123text', RefDef2Arg())
161  assert_equal('99text', RefDef2Arg(99))
162  assert_equal('77some', RefDef2Arg(77, 'some'))
163
164  call CheckDefFailure(['let RefWrong: func(string?)'], 'E1010:')
165  call CheckDefFailure(['let RefWrong: func(?string, string)'], 'E1007:')
166
167  let RefVarargs: func(...list<string>): string
168  RefVarargs = FuncVarargs
169  assert_equal('', RefVarargs())
170  assert_equal('one', RefVarargs('one'))
171  assert_equal('one,two', RefVarargs('one', 'two'))
172
173  call CheckDefFailure(['let RefWrong: func(...list<string>, string)'], 'E110:')
174  call CheckDefFailure(['let RefWrong: func(...list<string>, ?string)'], 'E110:')
175enddef
176
177" Only varargs
178def MyVarargsOnly(...args: list<string>): string
179  return join(args, ',')
180enddef
181
182def Test_call_varargs_only()
183  assert_equal('', MyVarargsOnly())
184  assert_equal('one', MyVarargsOnly('one'))
185  assert_equal('one,two', MyVarargsOnly('one', 'two'))
186  call CheckDefFailure(['MyVarargsOnly(1)'], 'E1013: argument 1: type mismatch, expected string but got number')
187  call CheckDefFailure(['MyVarargsOnly("one", 2)'], 'E1013: argument 2: type mismatch, expected string but got number')
188enddef
189
190def Test_using_var_as_arg()
191  call writefile(['def Func(x: number)',  'let x = 234', 'enddef'], 'Xdef')
192  call assert_fails('so Xdef', 'E1006:')
193  call delete('Xdef')
194enddef
195
196def DictArg(arg: dict<string>)
197  arg['key'] = 'value'
198enddef
199
200def ListArg(arg: list<string>)
201  arg[0] = 'value'
202enddef
203
204def Test_assign_to_argument()
205  " works for dict and list
206  let d: dict<string> = {}
207  DictArg(d)
208  assert_equal('value', d['key'])
209  let l: list<string> = []
210  ListArg(l)
211  assert_equal('value', l[0])
212
213  call CheckScriptFailure(['def Func(arg: number)', 'arg = 3', 'enddef'], 'E1090:')
214enddef
215
216def Test_call_func_defined_later()
217  call assert_equal('one', g:DefinedLater('one'))
218  call assert_fails('call NotDefined("one")', 'E117:')
219enddef
220
221func DefinedLater(arg)
222  return a:arg
223endfunc
224
225def Test_call_funcref()
226  assert_equal(3, g:SomeFunc('abc'))
227  assert_fails('NotAFunc()', 'E117:')
228  assert_fails('g:NotAFunc()', 'E117:')
229enddef
230
231let SomeFunc = function('len')
232let NotAFunc = 'text'
233
234def CombineFuncrefTypes()
235  " same arguments, different return type
236  let Ref1: func(bool): string
237  let Ref2: func(bool): number
238  let Ref3: func(bool): any
239  Ref3 = g:cond ? Ref1 : Ref2
240
241  " different number of arguments
242  let Refa1: func(bool): number
243  let Refa2: func(bool, number): number
244  let Refa3: func: number
245  Refa3 = g:cond ? Refa1 : Refa2
246
247  " different argument types
248  let Refb1: func(bool, string): number
249  let Refb2: func(string, number): number
250  let Refb3: func(any, any): number
251  Refb3 = g:cond ? Refb1 : Refb2
252enddef
253
254def FuncWithForwardCall()
255  return g:DefinedEvenLater("yes")
256enddef
257
258def DefinedEvenLater(arg: string): string
259  return arg
260enddef
261
262def Test_error_in_nested_function()
263  " Error in called function requires unwinding the call stack.
264  assert_fails('call FuncWithForwardCall()', 'E1029')
265enddef
266
267def Test_return_type_wrong()
268  CheckScriptFailure(['def Func(): number', 'return "a"', 'enddef'], 'expected number but got string')
269  CheckScriptFailure(['def Func(): string', 'return 1', 'enddef'], 'expected string but got number')
270  CheckScriptFailure(['def Func(): void', 'return "a"', 'enddef'], 'expected void but got string')
271  CheckScriptFailure(['def Func()', 'return "a"', 'enddef'], 'expected void but got string')
272
273  CheckScriptFailure(['def Func(): number', 'return', 'enddef'], 'E1003:')
274
275  CheckScriptFailure(['def Func(): list', 'return []', 'enddef'], 'E1008:')
276  CheckScriptFailure(['def Func(): dict', 'return {}', 'enddef'], 'E1008:')
277  CheckScriptFailure(['def Func()', 'return 1'], 'E1057:')
278enddef
279
280def Test_arg_type_wrong()
281  CheckScriptFailure(['def Func3(items: list)', 'echo "a"', 'enddef'], 'E1008: Missing <type>')
282  CheckScriptFailure(['def Func4(...)', 'echo "a"', 'enddef'], 'E1055: Missing name after ...')
283  CheckScriptFailure(['def Func5(items:string)', 'echo "a"'], 'E1069:')
284  CheckScriptFailure(['def Func5(items)', 'echo "a"'], 'E1077:')
285enddef
286
287def Test_vim9script_call()
288  let lines =<< trim END
289    vim9script
290    let var = ''
291    def MyFunc(arg: string)
292       var = arg
293    enddef
294    MyFunc('foobar')
295    assert_equal('foobar', var)
296
297    let str = 'barfoo'
298    str->MyFunc()
299    assert_equal('barfoo', var)
300
301    let g:value = 'value'
302    g:value->MyFunc()
303    assert_equal('value', var)
304
305    let listvar = []
306    def ListFunc(arg: list<number>)
307       listvar = arg
308    enddef
309    [1, 2, 3]->ListFunc()
310    assert_equal([1, 2, 3], listvar)
311
312    let dictvar = {}
313    def DictFunc(arg: dict<number>)
314       dictvar = arg
315    enddef
316    {'a': 1, 'b': 2}->DictFunc()
317    assert_equal(#{a: 1, b: 2}, dictvar)
318    def CompiledDict()
319      {'a': 3, 'b': 4}->DictFunc()
320    enddef
321    CompiledDict()
322    assert_equal(#{a: 3, b: 4}, dictvar)
323
324    #{a: 3, b: 4}->DictFunc()
325    assert_equal(#{a: 3, b: 4}, dictvar)
326
327    ('text')->MyFunc()
328    assert_equal('text', var)
329    ("some")->MyFunc()
330    assert_equal('some', var)
331  END
332  writefile(lines, 'Xcall.vim')
333  source Xcall.vim
334  delete('Xcall.vim')
335enddef
336
337def Test_vim9script_call_fail_decl()
338  let lines =<< trim END
339    vim9script
340    let var = ''
341    def MyFunc(arg: string)
342       let var = 123
343    enddef
344  END
345  writefile(lines, 'Xcall_decl.vim')
346  assert_fails('source Xcall_decl.vim', 'E1054:')
347  delete('Xcall_decl.vim')
348enddef
349
350def Test_vim9script_call_fail_const()
351  let lines =<< trim END
352    vim9script
353    const var = ''
354    def MyFunc(arg: string)
355       var = 'asdf'
356    enddef
357  END
358  writefile(lines, 'Xcall_const.vim')
359  assert_fails('source Xcall_const.vim', 'E46:')
360  delete('Xcall_const.vim')
361enddef
362
363" Test that inside :function a Python function can be defined, :def is not
364" recognized.
365func Test_function_python()
366  CheckFeature python3
367  let py = 'python3'
368  execute py "<< EOF"
369def do_something():
370  return 1
371EOF
372endfunc
373
374def Test_delfunc()
375  let lines =<< trim END
376    vim9script
377    def g:GoneSoon()
378      echo 'hello'
379    enddef
380
381    def CallGoneSoon()
382      GoneSoon()
383    enddef
384
385    delfunc g:GoneSoon
386    CallGoneSoon()
387  END
388  writefile(lines, 'XToDelFunc')
389  assert_fails('so XToDelFunc', 'E933')
390  assert_fails('so XToDelFunc', 'E933')
391
392  delete('XToDelFunc')
393enddef
394
395def Test_redef_failure()
396  call writefile(['def Func0(): string',  'return "Func0"', 'enddef'], 'Xdef')
397  so Xdef
398  call writefile(['def Func1(): string',  'return "Func1"', 'enddef'], 'Xdef')
399  so Xdef
400  call writefile(['def! Func0(): string', 'enddef'], 'Xdef')
401  call assert_fails('so Xdef', 'E1027:')
402  call writefile(['def Func2(): string',  'return "Func2"', 'enddef'], 'Xdef')
403  so Xdef
404  call delete('Xdef')
405
406  call assert_equal(0, g:Func0())
407  call assert_equal('Func1', g:Func1())
408  call assert_equal('Func2', g:Func2())
409
410  delfunc! Func0
411  delfunc! Func1
412  delfunc! Func2
413enddef
414
415def Test_vim9script_func()
416  let lines =<< trim END
417    vim9script
418    func Func(arg)
419      echo a:arg
420    endfunc
421    Func('text')
422  END
423  writefile(lines, 'XVim9Func')
424  so XVim9Func
425
426  delete('XVim9Func')
427enddef
428
429" Test for internal functions returning different types
430func Test_InternalFuncRetType()
431  let lines =<< trim END
432    def RetFloat(): float
433      return ceil(1.456)
434    enddef
435
436    def RetListAny(): list<any>
437      return items({'k' : 'v'})
438    enddef
439
440    def RetListString(): list<string>
441      return split('a:b:c', ':')
442    enddef
443
444    def RetListDictAny(): list<dict<any>>
445      return getbufinfo()
446    enddef
447
448    def RetDictNumber(): dict<number>
449      return wordcount()
450    enddef
451
452    def RetDictString(): dict<string>
453      return environ()
454    enddef
455  END
456  call writefile(lines, 'Xscript')
457  source Xscript
458
459  call assert_equal(2.0, RetFloat())
460  call assert_equal([['k', 'v']], RetListAny())
461  call assert_equal(['a', 'b', 'c'], RetListString())
462  call assert_notequal([], RetListDictAny())
463  call assert_notequal({}, RetDictNumber())
464  call assert_notequal({}, RetDictString())
465  call delete('Xscript')
466endfunc
467
468" Test for passing too many or too few arguments to internal functions
469func Test_internalfunc_arg_error()
470  let l =<< trim END
471    def! FArgErr(): float
472      return ceil(1.1, 2)
473    enddef
474  END
475  call writefile(l, 'Xinvalidarg')
476  call assert_fails('so Xinvalidarg', 'E118:')
477  let l =<< trim END
478    def! FArgErr(): float
479      return ceil()
480    enddef
481  END
482  call writefile(l, 'Xinvalidarg')
483  call assert_fails('so Xinvalidarg', 'E119:')
484  call delete('Xinvalidarg')
485endfunc
486
487let s:funcResult = 0
488
489def FuncNoArgNoRet()
490  funcResult = 11
491enddef
492
493def FuncNoArgRetNumber(): number
494  funcResult = 22
495  return 1234
496enddef
497
498def FuncNoArgRetString(): string
499  funcResult = 45
500  return 'text'
501enddef
502
503def FuncOneArgNoRet(arg: number)
504  funcResult = arg
505enddef
506
507def FuncOneArgRetNumber(arg: number): number
508  funcResult = arg
509  return arg
510enddef
511
512def FuncTwoArgNoRet(one: bool, two: number)
513  funcResult = two
514enddef
515
516def FuncOneArgRetString(arg: string): string
517  return arg
518enddef
519
520def FuncOneArgRetAny(arg: any): any
521  return arg
522enddef
523
524def Test_func_type()
525  let Ref1: func()
526  funcResult = 0
527  Ref1 = FuncNoArgNoRet
528  Ref1()
529  assert_equal(11, funcResult)
530
531  let Ref2: func
532  funcResult = 0
533  Ref2 = FuncNoArgNoRet
534  Ref2()
535  assert_equal(11, funcResult)
536
537  funcResult = 0
538  Ref2 = FuncOneArgNoRet
539  Ref2(12)
540  assert_equal(12, funcResult)
541
542  funcResult = 0
543  Ref2 = FuncNoArgRetNumber
544  assert_equal(1234, Ref2())
545  assert_equal(22, funcResult)
546
547  funcResult = 0
548  Ref2 = FuncOneArgRetNumber
549  assert_equal(13, Ref2(13))
550  assert_equal(13, funcResult)
551enddef
552
553def Test_func_type_part()
554  let RefVoid: func: void
555  RefVoid = FuncNoArgNoRet
556  RefVoid = FuncOneArgNoRet
557  CheckDefFailure(['let RefVoid: func: void', 'RefVoid = FuncNoArgRetNumber'], 'E1013: type mismatch, expected func() but got func(): number')
558  CheckDefFailure(['let RefVoid: func: void', 'RefVoid = FuncNoArgRetString'], 'E1013: type mismatch, expected func() but got func(): string')
559
560  let RefAny: func(): any
561  RefAny = FuncNoArgRetNumber
562  RefAny = FuncNoArgRetString
563  CheckDefFailure(['let RefAny: func(): any', 'RefAny = FuncNoArgNoRet'], 'E1013: type mismatch, expected func(): any but got func()')
564  CheckDefFailure(['let RefAny: func(): any', 'RefAny = FuncOneArgNoRet'], 'E1013: type mismatch, expected func(): any but got func(number)')
565
566  let RefNr: func: number
567  RefNr = FuncNoArgRetNumber
568  RefNr = FuncOneArgRetNumber
569  CheckDefFailure(['let RefNr: func: number', 'RefNr = FuncNoArgNoRet'], 'E1013: type mismatch, expected func(): number but got func()')
570  CheckDefFailure(['let RefNr: func: number', 'RefNr = FuncNoArgRetString'], 'E1013: type mismatch, expected func(): number but got func(): string')
571
572  let RefStr: func: string
573  RefStr = FuncNoArgRetString
574  RefStr = FuncOneArgRetString
575  CheckDefFailure(['let RefStr: func: string', 'RefStr = FuncNoArgNoRet'], 'E1013: type mismatch, expected func(): string but got func()')
576  CheckDefFailure(['let RefStr: func: string', 'RefStr = FuncNoArgRetNumber'], 'E1013: type mismatch, expected func(): string but got func(): number')
577enddef
578
579def Test_func_type_fails()
580  CheckDefFailure(['let ref1: func()'], 'E704:')
581
582  CheckDefFailure(['let Ref1: func()', 'Ref1 = FuncNoArgRetNumber'], 'E1013: type mismatch, expected func() but got func(): number')
583  CheckDefFailure(['let Ref1: func()', 'Ref1 = FuncOneArgNoRet'], 'E1013: type mismatch, expected func() but got func(number)')
584  CheckDefFailure(['let Ref1: func()', 'Ref1 = FuncOneArgRetNumber'], 'E1013: type mismatch, expected func() but got func(number): number')
585  CheckDefFailure(['let Ref1: func(bool)', 'Ref1 = FuncTwoArgNoRet'], 'E1013: type mismatch, expected func(bool) but got func(bool, number)')
586  CheckDefFailure(['let Ref1: func(?bool)', 'Ref1 = FuncTwoArgNoRet'], 'E1013: type mismatch, expected func(?bool) but got func(bool, number)')
587  CheckDefFailure(['let Ref1: func(...bool)', 'Ref1 = FuncTwoArgNoRet'], 'E1013: type mismatch, expected func(...bool) but got func(bool, number)')
588
589  call CheckDefFailure(['let RefWrong: func(string ,number)'], 'E1068:')
590  call CheckDefFailure(['let RefWrong: func(string,number)'], 'E1069:')
591  call CheckDefFailure(['let RefWrong: func(bool, bool, bool, bool, bool, bool, bool, bool, bool, bool, bool, bool, bool, bool, bool, bool, bool, bool, bool, bool)'], 'E740:')
592  call CheckDefFailure(['let RefWrong: func(bool):string'], 'E1069:')
593enddef
594
595def Test_func_return_type()
596  let nr: number
597  nr = FuncNoArgRetNumber()
598  assert_equal(1234, nr)
599
600  nr = FuncOneArgRetAny(122)
601  assert_equal(122, nr)
602
603  let str: string
604  str = FuncOneArgRetAny('yes')
605  assert_equal('yes', str)
606
607  CheckDefFailure(['let str: string', 'str = FuncNoArgRetNumber()'], 'E1013: type mismatch, expected string but got number')
608enddef
609
610def MultiLine(
611    arg1: string,
612    arg2 = 1234,
613    ...rest: list<string>
614      ): string
615  return arg1 .. arg2 .. join(rest, '-')
616enddef
617
618def MultiLineComment(
619    arg1: string, # comment
620    arg2 = 1234, # comment
621    ...rest: list<string> # comment
622      ): string # comment
623  return arg1 .. arg2 .. join(rest, '-')
624enddef
625
626def Test_multiline()
627  assert_equal('text1234', MultiLine('text'))
628  assert_equal('text777', MultiLine('text', 777))
629  assert_equal('text777one', MultiLine('text', 777, 'one'))
630  assert_equal('text777one-two', MultiLine('text', 777, 'one', 'two'))
631enddef
632
633func Test_multiline_not_vim9()
634  call assert_equal('text1234', MultiLine('text'))
635  call assert_equal('text777', MultiLine('text', 777))
636  call assert_equal('text777one', MultiLine('text', 777, 'one'))
637  call assert_equal('text777one-two', MultiLine('text', 777, 'one', 'two'))
638endfunc
639
640
641" When using CheckScriptFailure() for the below test, E1010 is generated instead
642" of E1056.
643func Test_E1056_1059()
644  let caught_1056 = 0
645  try
646    def F():
647      return 1
648    enddef
649  catch /E1056:/
650    let caught_1056 = 1
651  endtry
652  call assert_equal(1, caught_1056)
653
654  let caught_1059 = 0
655  try
656    def F5(items : list)
657      echo 'a'
658    enddef
659  catch /E1059:/
660    let caught_1059 = 1
661  endtry
662  call assert_equal(1, caught_1059)
663endfunc
664
665func DelMe()
666  echo 'DelMe'
667endfunc
668
669def Test_deleted_function()
670  CheckDefExecFailure([
671      'let RefMe: func = function("g:DelMe")',
672      'delfunc g:DelMe',
673      'echo RefMe()'], 'E117:')
674enddef
675
676def Test_unknown_function()
677  CheckDefExecFailure([
678      'let Ref: func = function("NotExist")',
679      'delfunc g:NotExist'], 'E130:')
680enddef
681
682def RefFunc(Ref: func(string): string): string
683  return Ref('more')
684enddef
685
686def Test_closure_simple()
687  let local = 'some '
688  assert_equal('some more', RefFunc({s -> local .. s}))
689enddef
690
691def MakeRef()
692  let local = 'some '
693  g:Ref = {s -> local .. s}
694enddef
695
696def Test_closure_ref_after_return()
697  MakeRef()
698  assert_equal('some thing', g:Ref('thing'))
699  unlet g:Ref
700enddef
701
702def MakeTwoRefs()
703  let local = ['some']
704  g:Extend = {s -> local->add(s)}
705  g:Read = {-> local}
706enddef
707
708def Test_closure_two_refs()
709  MakeTwoRefs()
710  assert_equal('some', join(g:Read(), ' '))
711  g:Extend('more')
712  assert_equal('some more', join(g:Read(), ' '))
713  g:Extend('even')
714  assert_equal('some more even', join(g:Read(), ' '))
715
716  unlet g:Extend
717  unlet g:Read
718enddef
719
720def ReadRef(Ref: func(): list<string>): string
721  return join(Ref(), ' ')
722enddef
723
724def ExtendRef(Ref: func(string), add: string)
725  Ref(add)
726enddef
727
728def Test_closure_two_indirect_refs()
729  MakeTwoRefs()
730  assert_equal('some', ReadRef(g:Read))
731  ExtendRef(g:Extend, 'more')
732  assert_equal('some more', ReadRef(g:Read))
733  ExtendRef(g:Extend, 'even')
734  assert_equal('some more even', ReadRef(g:Read))
735
736  unlet g:Extend
737  unlet g:Read
738enddef
739
740def MakeArgRefs(theArg: string)
741  let local = 'loc_val'
742  g:UseArg = {s -> theArg .. '/' .. local .. '/' .. s}
743enddef
744
745def MakeArgRefsVarargs(theArg: string, ...rest: list<string>)
746  let local = 'the_loc'
747  g:UseVararg = {s -> theArg .. '/' .. local .. '/' .. s .. '/' .. join(rest)}
748enddef
749
750def Test_closure_using_argument()
751  MakeArgRefs('arg_val')
752  assert_equal('arg_val/loc_val/call_val', g:UseArg('call_val'))
753
754  MakeArgRefsVarargs('arg_val', 'one', 'two')
755  assert_equal('arg_val/the_loc/call_val/one two', g:UseVararg('call_val'))
756
757  unlet g:UseArg
758  unlet g:UseVararg
759enddef
760
761def MakeGetAndAppendRefs()
762  let local = 'a'
763
764  def Append(arg: string)
765    local ..= arg
766  enddef
767  g:Append = Append
768
769  def Get(): string
770    return local
771  enddef
772  g:Get = Get
773enddef
774
775def Test_closure_append_get()
776  MakeGetAndAppendRefs()
777  assert_equal('a', g:Get())
778  g:Append('-b')
779  assert_equal('a-b', g:Get())
780  g:Append('-c')
781  assert_equal('a-b-c', g:Get())
782
783  unlet g:Append
784  unlet g:Get
785enddef
786
787def Test_nested_closure()
788  let local = 'text'
789  def Closure(arg: string): string
790    return local .. arg
791  enddef
792  assert_equal('text!!!', Closure('!!!'))
793enddef
794
795func GetResult(Ref)
796  return a:Ref('some')
797endfunc
798
799def Test_call_closure_not_compiled()
800  let text = 'text'
801  g:Ref = {s ->  s .. text}
802  assert_equal('sometext', GetResult(g:Ref))
803enddef
804
805
806" vim: ts=8 sw=2 sts=2 expandtab tw=80 fdm=marker
807