Added sol

Author: abulgit

compiler/src/dmd/templatesem.d

@@ -973,6 +973,10 @@ extern (D) MATCHpair deduceFunctionTemplateMatch(TemplateDeclaration td, Templat
             }
             if (fname && !foundName)
             {
+                // This is where we need to handle the error case when a named argument
+                // doesn't match any parameter name in a templated function
+                // Similar to the error generated in mtype.d's resolveNamedArgs
+                error(instLoc, "no parameter named `%s`", fname.toChars());
                 argi = DEFAULT_ARGI;
             }
 

compiler/test/fail_compilation/template_named_args_test.d

@@ -0,0 +1,15 @@
+/*
+TEST_OUTPUT:
+---
+fail_compilation/template_named_args_test.d(14): Error: no parameter named `x`
+fail_compilation/template_named_args_test.d(14): Error: template `gun` is not callable using argument types `!()(int)`
+fail_compilation/template_named_args_test.d(10):        Candidate is: `gun(T)(T a)`
+---
+*/
+
+void gun(T)(T a) {}
+
+void main()
+{
+	gun(x: 1); // (no explanation)
+}