compiler/Generator.cs

@@ -301,13 +301,13 @@ public class Generator
         {
             foreach (var @case in statement.Cases)
             {
-                var tag = enumInfo.Variants.ToList().FindIndex(x => x.Name == @case.Type.Ident);
+                var tag = enumInfo.Variants.ToList().FindIndex(x => x.Name == @case.Variant.Ident);
 
                 writer.WriteLine($"case {tag}:");
                 writer.WriteLine("{");
                 using (writer.Indent())
                 {
-                    writer.WriteLine($"auto {@case.VariableName.Ident} = {target}.{@case.Type.Ident};");
+                    writer.WriteLine($"auto {@case.VariableName.Ident} = {target}.{@case.Variant.Ident};");
                     EmitStatement(@case.Body);
                 }
                 writer.WriteLine("}");

compiler/TypeChecker.cs

@@ -191,9 +191,22 @@ public class TypeChecker
         if (target.Type is not NubTypeEnum enumType)
             throw BasicError("A match statement can only be used on enum types", target);
 
+        if (!moduleGraph.TryResolveType(enumType.Module, enumType.Name, enumType.Module == currentModule, out var info))
+            throw BasicError($"Type '{enumType}' not found", target);
+
+        if (info is not Module.TypeInfoEnum enumInfo)
+            throw BasicError($"Type '{enumType}' is not an enum", target);
+
+        var uncoveredCases = enumInfo.Variants.Select(x => x.Name).ToList();
+
         var cases = new List<TypedNodeStatementMatch.Case>();
         foreach (var @case in statement.Cases)
         {
+            if (!enumInfo.Variants.Any(x => x.Name == @case.Variant.Ident))
+                throw BasicError($"Enum type'{enumType}' does not have a variant named '{@case.Variant.Ident}'", @case.Variant);
+
+            uncoveredCases.Remove(@case.Variant.Ident);
+
             using (scope.EnterScope())
             {
                 scope.DeclareIdentifier(@case.VariableName.Ident, NubTypeEnumVariant.Get(NubTypeEnum.Get(enumType.Module, enumType.Name), @case.Variant.Ident));
@@ -202,6 +215,9 @@ public class TypeChecker
             }
         }
 
+        if (uncoveredCases.Any())
+            throw BasicError($"Match statement does not cover the following cases: {string.Join(", ",  uncoveredCases)}", statement);
+
         return new TypedNodeStatementMatch(statement.Tokens, target, cases);
     }
 
@@ -791,7 +807,7 @@ public class TypedNodeStatementMatch(List<Token> tokens, TypedNodeExpression tar
 
     public class Case(List<Token> tokens, TokenIdent type, TokenIdent variableName, TypedNodeStatement body) : Node(tokens)
     {
-        public TokenIdent Type { get; } = type;
+        public TokenIdent Variant { get; } = type;
         public TokenIdent VariableName { get; } = variableName;
         public TypedNodeStatement Body { get; } = body;
     }

examples/math/math.nub

@@ -1,53 +1,34 @@
 module math
 
-export struct vec2 {
+export struct Human {
+    name: string
+    age: i32
+}
+
+export struct Pos {
     x: i32
     y: i32
 }
 
-export struct vec3 {
-    x: i32
-    y: i32
-    z: i32
-}
-
-export struct color {
-    r: i32
-    g: i32
-    b: i32
-    a: i32
-}
-
-export struct example {
-    b: color
-}
-
-export enum message {
-    quit: {}
-    move: color
+export enum Message {
+    Quit: {}
+    Move: Pos
 }
 
 export func add(a: i32 b: i32): i32
 {
-    let message: message = enum message::move { 
-        r = 23
-        g = 46
-        b = 56
+    let msg: Message = enum Message::Move { 
+        x = 10
+        y = 10
     }
 
-    match message {
-        quit q {}
-        move m {
-            m.r = 23
-            m.g = 23
-            m.b = 23
+    match msg {
+        Quit q {
+            // quit
+        }
+        Move m {
+            // move
         }
-    }
-
-    let color: color = {
-        r = 23
-        g = 23
-        b = 23
     }
 
     return add_internal(a b)