Avoid interpreting named args as labels when indenting newline in keep_line_breaks mode.

src/dfmt/formatter.d

@@ -1783,6 +1783,8 @@ private:
 
         if (hasCurrent)
         {
+            const isNamedArg = index + 1 < tokens.length
+                && astInformation.namedArgumentColonLocations.canFindIndex(tokens[index + 1].index);
             if (currentIs(tok!"else"))
             {
                 immutable i = indents.indentToMostRecent(tok!"if");
@@ -1791,7 +1793,7 @@ private:
                 if (mostRecent != -1)
                     indentLevel = mostRecent;
             }
-            else if (currentIs(tok!"identifier") && peekIs(tok!":"))
+            else if (currentIs(tok!"identifier") && peekIs(tok!":") && !isNamedArg)
             {
                 if (peekBackIs(tok!"}", true) || peekBackIs(tok!";", true))
                     indents.popTempIndents();

tests/allman/issue0586.d.ref

@@ -26,3 +26,8 @@ void main()
 
     temp(v1: () { S s = S(i: 5); return s.i; }, v2: 1);
 }
+
+void test()
+{
+    return Struct(foo: field.foo, bar: field.bar, baz: field.baz);
+}

tests/issue0586.d

@@ -29,3 +29,10 @@ void main()
 
     temp(v1: () { S s = S(i: 5); return s.i; }, v2: 1);
 }
+
+void test() {
+    return Struct(
+        foo: field.foo,
+        bar: field.bar,
+        baz: field.baz);
+}

tests/knr/issue0586.d.ref

@@ -25,3 +25,8 @@ void main()
 
     temp(v1: () { S s = S(i: 5); return s.i; }, v2: 1);
 }
+
+void test()
+{
+    return Struct(foo: field.foo, bar: field.bar, baz: field.baz);
+}

tests/otbs/issue0586.d.ref

@@ -22,3 +22,7 @@ void main() {
 
     temp(v1: () { S s = S(i: 5); return s.i; }, v2: 1);
 }
+
+void test() {
+    return Struct(foo: field.foo, bar: field.bar, baz: field.baz);
+}