Add NEWS entries for lambda/capture-list functionality

NEWS

@@ -9,6 +9,12 @@ Zeek 4.1.0
 New Functionality
 -----------------
 
+- Lambda functions can now use capture-list to help specify exactly which local
+  variables from outer scopes need to made available while evaluating the lambda
+  and also the method by which they're made available: deep vs. shallow copy.
+
+  For examples, see: https://docs.zeek.org/en/master/script-reference/types.html#type-function
+
 Changed Functionality
 ---------------------
 
@@ -21,6 +27,13 @@ Removed Functionality
 Deprecated Functionality
 ------------------------
 
+- Lambda/closure support: automatic capturing of references to variables
+  outside a lambda's scope is now deprecated.  An explicit capture
+  list which also specifies the desired copy-semantics is now required when
+  writing lambda functions that refer to local variables of an outer scope.
+
+  For examples, see: https://docs.zeek.org/en/master/script-reference/types.html#type-function
+
 Zeek 4.0.0
 ==========
 

src/Expr.cc

@@ -4429,6 +4429,7 @@ void LambdaExpr::CheckCaptures()
 		{
 		if ( outer_ids.size() > 0 )
 			{
+			// TODO: Remove in v5.1: these deprecated closure semantics
 			reporter->Warning("use of outer identifiers in lambdas without [] captures is deprecated: %s%s",
 				outer_ids.size() > 1 ? "e.g., " : "",
 				outer_ids[0]->Name());