diff --git a/parser.c b/parser.c
index 5ece824..7a8cfc8 100644
--- a/parser.c
+++ b/parser.c
@@ -15,6 +15,7 @@ static AstNodeIndex parseTypeExpr(Parser*);
 static AstNodeIndex parseBlock(Parser* p);
 static AstNodeIndex parseLabeledStatement(Parser*);
 static AstNodeIndex parseExpr(Parser*);
+static AstNodeIndex expectExpr(Parser*);
 
 typedef struct {
     enum { FIELD_STATE_NONE, FIELD_STATE_SEEN, FIELD_STATE_END } tag;
@@ -219,8 +220,8 @@ static AstNodeIndex expectContainerField(Parser* p) {
 }
 
 static AstNodeIndex parseBuiltinCall(Parser* p) {
-    const AstNodeIndex builtin_token = assertToken(p, TOKEN_BUILTIN);
-    eatToken(p, TOKEN_L_PAREN);
+    const AstTokenIndex builtin_token = assertToken(p, TOKEN_BUILTIN);
+    assertToken(p, TOKEN_L_PAREN);
 
     CleanupScratch scratch_top __attribute__((__cleanup__(cleanupScratch)))
     = initCleanupScratch(p);
@@ -229,16 +230,75 @@ static AstNodeIndex parseBuiltinCall(Parser* p) {
         if (eatToken(p, TOKEN_R_PAREN) != null_token)
             break;
 
-        const AstNodeIndex param = parseExpr(p);
+        const AstNodeIndex param = expectExpr(p);
         SLICE_APPEND(AstNodeIndex, &p->scratch, param);
-        // TODO finish
+        switch (p->token_tags[p->tok_i]) {
+        case TOKEN_COMMA:
+            p->tok_i++;
+            break;
+        case TOKEN_R_PAREN:
+            p->tok_i++;
+            goto next;
+        default:
+            fprintf(stderr, "expected comma after arg\n");
+            exit(1);
+        }
+    next:;
     }
 
-    (void)builtin_token;
-
-    fprintf(stderr, "parseBuiltinCall not implemented\n");
-    exit(1);
-    return 0; // tcc
+    const bool comma = (p->token_tags[p->tok_i - 2] == TOKEN_COMMA);
+    const uint32_t params_len = p->scratch.len - scratch_top.old_len;
+    switch (params_len) {
+    case 0:
+        return addNode(&p->nodes,
+            (AstNodeItem) {
+                .tag = AST_NODE_BUILTIN_CALL_TWO,
+                .main_token = builtin_token,
+                .data = {
+                    .lhs = 0,
+                    .rhs = 0,
+                },
+            });
+    case 1:
+        return addNode(&p->nodes,
+            (AstNodeItem) {
+                .tag = comma ?
+                    AST_NODE_BUILTIN_CALL_TWO_COMMA :
+                    AST_NODE_BUILTIN_CALL_TWO,
+                .main_token = builtin_token,
+                .data = {
+                    .lhs = p->scratch.arr[scratch_top.old_len],
+                    .rhs = 0,
+                },
+            });
+    case 2:
+        return addNode(&p->nodes,
+            (AstNodeItem) {
+                .tag = comma ?
+                    AST_NODE_BUILTIN_CALL_TWO_COMMA :
+                    AST_NODE_BUILTIN_CALL_TWO,
+                .main_token = builtin_token,
+                .data = {
+                    .lhs = p->scratch.arr[scratch_top.old_len],
+                    .rhs = p->scratch.arr[scratch_top.old_len+1],
+                },
+            });
+    default:;
+        const AstSubRange span
+            = listToSpan(p, &p->scratch.arr[scratch_top.old_len], params_len);
+        return addNode(
+                &p->nodes,
+                (AstNodeItem) {
+                    .tag = comma ?
+                        AST_NODE_BUILTIN_CALL_COMMA :
+                        AST_NODE_BUILTIN_CALL,
+                    .main_token = builtin_token,
+                    .data = {
+                        .lhs = span.start,
+                        .rhs = span.end,
+                    },
+                });
+    }
 }
 
 static AstNodeIndex parsePrimaryTypeExpr(Parser* p) {
@@ -248,7 +308,16 @@ static AstNodeIndex parsePrimaryTypeExpr(Parser* p) {
     case TOKEN_NUMBER_LITERAL:
     case TOKEN_KEYWORD_UNREACHABLE:
     case TOKEN_KEYWORD_ANYFRAME:
+        fprintf(stderr, "parsePrimaryTypeExpr does not support %s\n",
+            tokenizerGetTagString(tok));
+        exit(1);
     case TOKEN_STRING_LITERAL:
+        return addNode(&p->nodes,
+            (AstNodeItem) {
+                .tag = AST_NODE_STRING_LITERAL,
+                .main_token = nextToken(p),
+                .data = {},
+            });
     case TOKEN_BUILTIN:
         return parseBuiltinCall(p);
     case TOKEN_KEYWORD_FN:
@@ -700,7 +769,6 @@ static OperInfo operTable(TokenizerTag tok_tag) {
 }
 
 static AstNodeIndex parseExprPrecedence(Parser* p, int32_t min_prec) {
-    (void)p;
     assert(min_prec >= 0);
 
     AstNodeIndex node = parsePrefixExpr(p);
@@ -746,6 +814,12 @@ static AstNodeIndex parseExprPrecedence(Parser* p, int32_t min_prec) {
 
 static AstNodeIndex parseExpr(Parser* p) { return parseExprPrecedence(p, 0); }
 
+static AstNodeIndex expectExpr(Parser* p) {
+    const AstNodeIndex node = parseExpr(p);
+    assert(node != 0);
+    return node;
+}
+
 static AstNodeIndex parsePrimaryExpr(Parser* p) {
     const char* tok = tokenizerGetTagString(p->token_tags[p->tok_i]);
     switch (p->token_tags[p->tok_i]) {
@@ -812,6 +886,8 @@ static AstNodeIndex parsePrimaryExpr(Parser* p) {
     default:
         return parseCurlySuffixExpr(p);
     }
+
+    return 0; // tcc
 }
 
 static AstNodeIndex parsePrefixExpr(Parser* p) {
diff --git a/tokenizer_test.zig b/tokenizer_test.zig
index efe8f64..70889d6 100644
--- a/tokenizer_test.zig
+++ b/tokenizer_test.zig
@@ -162,6 +162,29 @@ fn testTokenize(source: [:0]const u8, expected_token_tags: []const Token.Tag) !v
     try std.testing.expectEqual(source.len, last_token.loc.end);
 }
 
+test "my function" {
+    try testTokenize(
+        \\pub fn main() void {
+        \\    @panic("hello");
+        \\}
+        \\
+    , &.{
+        .keyword_pub,
+        .keyword_fn,
+        .identifier,
+        .l_paren,
+        .r_paren,
+        .identifier,
+        .l_brace,
+        .builtin,
+        .l_paren,
+        .string_literal,
+        .r_paren,
+        .semicolon,
+        .r_brace,
+    });
+}
+
 test "keywords" {
     try testTokenize("test const else", &.{ .keyword_test, .keyword_const, .keyword_else });
 }