Suggest each if map function returns void (#10887)

benjones · web-flow · commit 748ea8a17dc3 · 2025-10-31T09:34:05.000+08:00
diff --git a/std/algorithm/iteration.d b/std/algorithm/iteration.d
@@ -659,7 +659,8 @@ if (fun.length >= 1)
         foreach (f; _funs)
         {
             static assert(!is(typeof(f(RE.init)) == void),
-                    "Mapping function(s) must not return void: " ~ _funs.stringof);
+                    "Mapping function(s) must not return void. " ~
+                    " Consider using `each` instead of `map!(" ~ _funs.stringof ~ ")`");
         }
 
         return MapResult!(_fun, Range)(r);

Original file line number	Diff line number	Diff line change
`@@ -659,7 +659,8 @@ if (fun.length >= 1)`
`659`	`659`	`foreach (f; _funs)`
`660`	`660`	`{`
`661`	`661`	`static assert(!is(typeof(f(RE.init)) == void),`
`662`		`- "Mapping function(s) must not return void: " ~ _funs.stringof);`
	`662`	`+ "Mapping function(s) must not return void. " ~`
	`663`	+ " Consider using `each` instead of `map!(" ~ _funs.stringof ~ ")`");
`663`	`664`	`}`
`664`	`665`
`665`	`666`	`return MapResult!(_fun, Range)(r);`