diff --git a/src/parser.bux b/src/parser.bux
index 8a79311..2e540b3 100644
--- a/src/parser.bux
+++ b/src/parser.bux
@@ -2168,6 +2168,7 @@ module Parser {
         parserParseTypeParams(p, d);
 
         discard parserExpect(p, tkLBrace, "expected '{'");
+        var lastWasComma: bool = false;
         while !parserCheck(p, tkRBrace) && parserPeek(p, 0) != tkEndOfFile {
             if fieldCount >= 256 {
                 parserEmitDiag(p, line, col, "too many struct fields (max 255)");
@@ -2176,14 +2177,16 @@ module Parser {
             if parserCheck(p, tkNewLine) { discard parserAdvance(p); continue; }
             if parserCheck(p, tkSemicolon) { discard parserAdvance(p); continue; }
             // Commas are also valid field separators (incl. trailing comma before '}')
-            if parserCheck(p, tkComma) { discard parserAdvance(p); continue; }
+            if parserCheck(p, tkComma) {
+                if fieldCount == 0 || lastWasComma {
+                    parserEmitDiag(p, parserCurToken(p).line, parserCurToken(p).column, "expected field name");
+                }
+                lastWasComma = true;
+                discard parserAdvance(p);
+                continue;
+            }
             let beforePos: int = p.pos;
             let fName: LexToken = parserExpectIdentOrKeyword(p, "expected field name");
-            if fieldCount >= 250 && fieldCount <= 256 {
-                PrintLine(String_Concat("RAW fieldCount=", bux_int_to_str(fieldCount as int64)));
-                PrintLine(String_Concat("RAW fName=", fName.text));
-                PrintLine(String_Concat("RAW pos=", bux_int_to_str(p.pos as int64)));
-            }
             discard parserExpect(p, tkColon, "expected ':' in struct field");
             let fType: *TypeExpr = parserParseType(p);
             parserMatch(p, tkSemicolon);
@@ -2196,6 +2199,7 @@ module Parser {
             d.fields[fieldCount].name = fName.text;
             d.fields[fieldCount].refFieldType = fType;
             fieldCount = fieldCount + 1;
+            lastWasComma = false;
         }
         d.fieldCount = fieldCount;
         discard parserExpect(p, tkRBrace, "expected '}'");
diff --git a/src/sema.bux b/src/sema.bux
index a0cdfff..cb45548 100644
--- a/src/sema.bux
+++ b/src/sema.bux
@@ -360,6 +360,34 @@ module Sema {
             i = i + 1;
         }
 
+        // Report named args that match no parameter
+        var checkArg: *ExprList = expr.callArgs;
+        while checkArg != null as *ExprList {
+            if !String_Eq(checkArg.argName, "") {
+                var foundName: bool = false;
+                var j: int = 0;
+                while j < decl.paramCount {
+                    var pj: *Param = null as *Param;
+                    if j == 0 { pj = &decl.param0; }
+                    else if j == 1 { pj = &decl.param1; }
+                    else if j == 2 { pj = &decl.param2; }
+                    else if j == 3 { pj = &decl.param3; }
+                    else if j == 4 { pj = &decl.param4; }
+                    else if j == 5 { pj = &decl.param5; }
+                    else if j == 6 { pj = &decl.param6; }
+                    else if j == 7 { pj = &decl.param7; }
+                    else if j == 8 { pj = &decl.param8; }
+                    if String_Eq(checkArg.argName, pj.name) { foundName = true; }
+                    j = j + 1;
+                }
+                if !foundName {
+                    Sema_EmitError(sema, expr.line, expr.column,
+                        String_Concat("unknown argument name '", String_Concat(checkArg.argName, "'")));
+                }
+            }
+            checkArg = checkArg.next;
+        }
+
         expr.callArgs = newFirst;
         expr.callArgCount = newCount;
     }
@@ -1227,6 +1255,10 @@ module Sema {
 
         // Struct init: TypeName { field: value, ... }
         if kind == ekStructInit {
+            let te: *TypeExpr = bux_alloc(sizeof(TypeExpr)) as *TypeExpr;
+            te.kind = tekNamed;
+            te.typeName = expr.structName;
+            expr.refType = te;
             return tyNamed;
         }