I forgot about commas

src/lexer/SolsToken.h

@@ -10,7 +10,7 @@
 #include "SolsLiteral.h"
 
 typedef enum SolsTokenType {
-    STT_IDENTIFIER, STT_LITERAL, STT_TYPE, STT_DOT, STT_OPEN_CURLY, STT_CLOSE_CURLY, STT_OPEN_PAREN, STT_CLOSE_PAREN, STT_OP_ADD, STT_OP_SUB, STT_OP_MUL, STT_OP_DIV, STT_OP_ADDTO, STT_OP_SUBTO, STT_OP_MULTO, STT_OP_DIVTO, STT_OP_INCREMENT, STT_OP_DECREMENT, STT_OP_SET, STT_OP_GREATER, STT_OP_LESSER, STT_OP_EQUAL, STT_OP_INEQUAL, STT_OP_EQGREATER, STT_OP_EQLESSER, STT_KW_DEF, STT_KW_LAMBDA, STT_KW_STRUCT, STT_KW_PUTS, STT_KW_IF, STT_KW_WHILE, STT_KW_NEW, STT_KW_GROUND, STT_LINE_END
+    STT_IDENTIFIER, STT_LITERAL, STT_TYPE, STT_DOT, STT_OPEN_CURLY, STT_CLOSE_CURLY, STT_OPEN_PAREN, STT_CLOSE_PAREN, STT_OP_ADD, STT_OP_SUB, STT_OP_MUL, STT_OP_DIV, STT_OP_ADDTO, STT_OP_SUBTO, STT_OP_MULTO, STT_OP_DIVTO, STT_OP_INCREMENT, STT_OP_DECREMENT, STT_OP_SET, STT_OP_GREATER, STT_OP_LESSER, STT_OP_EQUAL, STT_OP_INEQUAL, STT_OP_EQGREATER, STT_OP_EQLESSER, STT_KW_DEF, STT_KW_LAMBDA, STT_KW_STRUCT, STT_KW_PUTS, STT_KW_IF, STT_KW_WHILE, STT_KW_NEW, STT_KW_GROUND, STT_LINE_END, STT_COMMA
 } SolsTokenType;
 
 typedef char* charptr;

src/lexer/lexer.c

@@ -36,6 +36,7 @@ struct _SolsTokenTypeMap SolsTokenTypeMap[] = {
     {"<=", STT_OP_EQLESSER},
     {"\n", STT_LINE_END},
     {";", STT_LINE_END},
+    {",", STT_COMMA},
     // Shh, this is our little secret
     // Your reward for actually reading the source code
     // Enable this by adding -DSUPER_SILLY_MODE to your 

src/parser/parser.c

@@ -1165,7 +1165,7 @@ static inline ResultType(Nothing, charptr) parseLambda(SolsParser* parser) {
             return Error(Nothing, charptr, type.as.error);
         }
 
-        // Pattern of type, name
+        // Pattern of type, name, comma
 
         SolsType tmpType;
 
@@ -1191,6 +1191,19 @@ static inline ResultType(Nothing, charptr) parseLambda(SolsParser* parser) {
         // Add type to constructed SolsType
         addChildToSolsType(&type.as.success, tmpType, argName);
         parserConsume(parser);
+
+        next = parserPeek(parser, 1);
+        if (next.error) {
+            return Error(Nothing, charptr, "Expecting a comma or closing bracket");
+        }
+        if (next.as.success.type == STT_CLOSE_PAREN) {
+            parserConsume(parser);
+            break;
+        }
+        if (next.as.success.type != STT_COMMA) {
+            return Error(Nothing, charptr, "Expecting a comma or closing bracket");
+        }
+        parserConsume(parser);
     }
 
     // Parse type at the end