Detect discard-returns in all block types

script/core/diagnostics/discard-returns.lua

@@ -12,9 +12,7 @@ return function (uri, callback)
     end
     ---@async
     guide.eachSourceType(state.ast, 'call', function (source)
-        local parent = source.parent
-        if  parent.type ~= 'function'
-        and parent.type ~= 'main' then
+        if not guide.isBlockType(source.parent) then
             return
         end
         await.delay()

test/diagnostics/discard-returns.lua

@@ -15,3 +15,249 @@ end
 
 X = f()
 ]]
+
+TEST [[
+---@nodiscard
+local function f()
+    return 1
+end
+
+for i = 1, 2 do
+    <!f()!>
+end
+]]
+
+TEST [[
+---@nodiscard
+local function f()
+    return 1
+end
+
+for i = 1, 2 do
+    local v = f()
+end
+]]
+
+TEST [[
+---@nodiscard
+local function f()
+    return 1
+end
+
+while true do
+    <!f()!>
+    break
+end
+]]
+
+TEST [[
+---@nodiscard
+local function f()
+    return 1
+end
+
+while true do
+    local v = f()
+    break
+end
+]]
+
+TEST [[
+---@nodiscard
+local function f()
+    return 1
+end
+
+repeat
+    <!f()!>
+    break
+until true
+]]
+
+TEST [[
+---@nodiscard
+local function f()
+    return 1
+end
+
+repeat
+    local v = f()
+    break
+until true
+]]
+
+TEST [[
+---@nodiscard
+local function f()
+    return 1
+end
+
+for index, value in ipairs({}) do
+    <!f()!>
+end
+]]
+
+TEST [[
+---@nodiscard
+local function f()
+    return 1
+end
+
+for index, value in ipairs({}) do
+    local v = f()
+end
+]]
+
+TEST [[
+---@nodiscard
+local function f()
+    return 1
+end
+
+if 1 == 1 then
+    <!f()!>
+end
+]]
+
+TEST [[
+---@nodiscard
+local function f()
+    return 1
+end
+
+if 1 == 1 then
+    local v = f()
+end
+]]
+
+TEST [[
+---@nodiscard
+local function f()
+    return 1
+end
+
+if 1 == 1 then
+    local v = f()
+else
+    <!f()!>
+end
+]]
+
+TEST [[
+---@nodiscard
+local function f()
+    return 1
+end
+
+if 1 == 1 then
+    local v = f()
+else
+    local v = f()
+end
+]]
+
+TEST [[
+---@nodiscard
+local function f()
+    return 1
+end
+
+if 1 == 1 then
+    local v = f()
+elseif 1 == 2 then
+    <!f()!>
+else
+    local v = f()
+end
+]]
+
+TEST [[
+---@nodiscard
+local function f()
+    return 1
+end
+
+if 1 == 1 then
+    local v = f()
+elseif 1 == 2 then
+    local v = f()
+else
+    local v = f()
+end
+]]
+
+TEST [[
+---@nodiscard
+local function f()
+    return 1
+end
+
+local function bar(callback)
+end
+
+bar(function ()
+    <!f()!>
+end)
+]]
+
+TEST [[
+---@nodiscard
+local function f()
+    return 1
+end
+
+local function bar(callback)
+end
+
+bar(function ()
+    local v = f()
+end)
+]]
+
+TEST [[
+---@nodiscard
+local function f()
+    return 1
+end
+
+do
+    <!f()!>
+end
+]]
+
+TEST [[
+---@nodiscard
+local function f()
+    return 1
+end
+
+do
+    local v = f()
+end
+]]
+
+TEST [[
+---@nodiscard
+local function f()
+    return 2
+end
+
+for i = 1, f() do
+end
+]]
+
+TEST [[
+---@nodiscard
+local function list_iter(t)
+    local i = 0
+    local n = #t
+    return function ()
+        i = i + 1
+        if i <= n then return t[i] end
+    end
+end
+
+local t = {10, 20, 30}
+for element in list_iter(t) do
+end
+]]