Two definitions for local function variables

How are you using the lua-language-server?

NeoVim

Which OS are you using?

Linux

What is the issue affecting?

Other

Expected Behaviour

Using vim.lsp.buf.definition() to go to the definition of a local function variable (assigned with the = operator), should give only a single definition at the local variable name.

Actual Behaviour

Using vim.lsp.buf.definition() to go to the definition of a local function variable (assigned with the = operator), gives two definitions on the same line. One is located at the variable name and the other is located at the beginning of the function key word.

Reproduction steps

1. Create a lua file with the following content:

local m = function() print "hello world" end

m()

2. Move the cursor on the m() function call
3. Execute the neovim command :lua vim.lsp.buf.definition()

Additional Notes

No response

Log File

[DEBUG][2023-12-16 17:31:59] .../lua/vim/lsp.lua:1391	"LSP[lua_ls]"	"client.request"	1	"textDocument/definition"	{  position = {    character = 0,    line = 2  },  textDocument = {    uri = "file:///home/tobias/.config/nvim/test.lua"  }}	<function 1>	147
[DEBUG][2023-12-16 17:31:59] .../vim/lsp/rpc.lua:284	"rpc.send"	{  id = 1559,  jsonrpc = "2.0",  method = "textDocument/definition",  params = {    position = {      character = 0,      line = 2    },    textDocument = {      uri = "file:///home/tobias/.config/nvim/test.lua"    }  }}
[DEBUG][2023-12-16 17:31:59] .../vim/lsp/rpc.lua:387	"rpc.receive"	{  id = 1559,  jsonrpc = "2.0",  result = { {      originSelectionRange = {        ["end"] = {          character = 1,          line = 2        },        start = {          character = 0,          line = 2        }      },      targetRange = {        ["end"] = {          character = 7,          line = 0        },        start = {          character = 6,          line = 0        }      },      targetSelectionRange = {        ["end"] = {          character = 7,          line = 0        },        start = {          character = 6,          line = 0        }      },      targetUri = "file:///home/tobias/.config/nvim/test.lua"    }, {      originSelectionRange = {        ["end"] = {          character = 1,          line = 2        },        start = {          character = 0,          line = 2        }      },      targetRange = {        ["end"] = {          character = 44,          line = 0        },        start = {          character = 10,          line = 0        }      },      targetSelectionRange = {        ["end"] = {          character = 44,          line = 0        },        start = {          character = 10,          line = 0        }      },      targetUri = "file:///home/tobias/.config/nvim/test.lua"    } }}
[DEBUG][2023-12-16 17:32:02] .../lua/vim/lsp.lua:1391	"LSP[lua_ls]"	"client.request"	1	"textDocument/codeLens"	{  textDocument = {    uri = "file:///home/tobias/.config/nvim/test.lua"  }}	<function 1>	147
[DEBUG][2023-12-16 17:32:02] .../vim/lsp/rpc.lua:284	"rpc.send"	{  id = 1560,  jsonrpc = "2.0",  method = "textDocument/codeLens",  params = {    textDocument = {      uri = "file:///home/tobias/.config/nvim/test.lua"    }  }}
[DEBUG][2023-12-16 17:32:02] .../vim/lsp/rpc.lua:387	"rpc.receive"	{  id = 1560,  jsonrpc = "2.0"}
[DEBUG][2023-12-16 17:32:02] .../lua/vim/lsp.lua:1391	"LSP[lua_ls]"	"client.request"	1	"textDocument/documentHighlight"	{  position = {    character = 0,    line = 2  },  textDocument = {    uri = "file:///home/tobias/.config/nvim/test.lua"  }}	<function 1>	147
[DEBUG][2023-12-16 17:32:02] .../vim/lsp/rpc.lua:284	"rpc.send"	{  id = 1561,  jsonrpc = "2.0",  method = "textDocument/documentHighlight",  params = {    position = {      character = 0,      line = 2    },    textDocument = {      uri = "file:///home/tobias/.config/nvim/test.lua"    }  }}
[DEBUG][2023-12-16 17:32:02] .../vim/lsp/rpc.lua:387	"rpc.receive"	{  id = 1561,  jsonrpc = "2.0",  result = { {      kind = 3,      range = {        ["end"] = {          character = 7,          line = 0        },        start = {          character = 6,          line = 0        }      }    }, {      kind = 2,      range = {        ["end"] = {          character = 1,          line = 2        },        start = {          character = 0,          line = 2        }      }    } }}
[TRACE][2023-12-16 17:32:02] ...lsp/handlers.lua:618	"default_handler"	"textDocument/documentHighlight"	{  ctx = '{\n  bufnr = 147,\n  client_id = 1,\n  method = "textDocument/documentHighlight",\n  params = {\n    position = {\n      character = 0,\n      line = 2\n    },\n    textDocument = {\n      uri = "file:///home/tobias/.config/nvim/test.lua"\n    }\n  }\n}',  result = { {      kind = 3,      range = {        ["end"] = {          character = 7,          line = 0        },        start = {          character = 6,          line = 0        }      }    }, {      kind = 2,      range = {        ["end"] = {          character = 1,          line = 2        },        start = {          character = 0,          line = 2        }      }    } }}

从 textDocument/definition 入口开始，使用 Neovim 的 vim.lsp.buf.definition() 和 issue 中的 Lua 代码片段重现该报告。追踪局部函数赋值为何会同时产生变量名和关键字 function 的范围；完成标准是请求只返回局部变量定义。