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vim-patch:8.1.1554: docs and tests for :const can be improved

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Problem:    Docs and tests for :const can be improved.
Solution:   Improve documentation, add a few more tests. (Ryuichi Hayashida,
            closes vim/vim#4551)
1c196e7b17
This commit is contained in:
rhysd 2019-06-23 21:04:51 +09:00
parent bd0615590b
commit 3d5a800278
2 changed files with 30 additions and 7 deletions
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13
runtime/doc/eval.txt
View File

@ -9631,15 +9631,10 @@ This does NOT work: >
If the system does not support deleting an environment
variable, it is made empty.
*:cons* *:const* *E996*
*:cons* *:const*
:cons[t] {var-name} = {expr1}
:cons[t] [{name1}, {name2}, ...] = {expr1}
:cons[t] [{name1}, {name2}, ...] .= {expr1}
:cons[t] [{name}, ..., ; {lastname}] = {expr1}
:cons[t] {var-name} =<< [trim] {marker}
text...
text...
{marker}
Similar to |:let|, but additionally lock the variable
after setting the value. This is the same as locking
the variable with |:lockvar| just after |:let|, thus: >
@ -9653,7 +9648,11 @@ text...
|:const| does not allow to for changing a variable. >
:let x = 1
:const x = 2 " Error!
<
< *E996*
Note that environment variables, option values and
register values cannot be used here, since they cannot
be locked.
:lockv[ar][!] [depth] {name} ... *:lockvar* *:lockv*
Lock the internal variable {name}. Locking means that
it can no longer be changed (until it is unlocked).

24
src/nvim/testdir/test_const.vim
View File

@ -18,6 +18,19 @@ func Test_define_var_with_lock()
const b = v:true
const n = v:null
call assert_true(exists('i'))
call assert_true(exists('f'))
call assert_true(exists('s'))
call assert_true(exists('F'))
call assert_true(exists('l'))
call assert_true(exists('d'))
if has('channel')
call assert_true(exists('j'))
call assert_true(exists('c'))
endif
call assert_true(exists('b'))
call assert_true(exists('n'))
call assert_fails('let i = 1', 'E741:')
call assert_fails('let f = 1.1', 'E741:')
call assert_fails('let s = "vim"', 'E741:')
@ -199,6 +212,17 @@ func Test_const_with_special_variables()
call assert_fails('const &g:encoding = "utf-8"', 'E996:')
endfunc
func Test_const_with_eval_name()
let s = 'foo'
" eval name with :const should work
const abc_{s} = 1
const {s}{s} = 1
let s2 = 'abc_foo'
call assert_fails('const {s2} = "bar"', 'E995:')
endfunc
func Test_lock_depth_is_1()
const l = [1, 2, 3]
const d = {'foo': 10}