parser: add function, comptime, var declaration tests

Port tests from upstream parser_test.zig:
- "respect line breaks before functions"
- "simple top level comptime block"
- "two spaced line comments before decl"
- "respect line breaks after var declarations"

Implement in parser.c:
- parseSuffixOp: array access (a[i]), field access (a.b),
  deref (a.*), unwrap optional (a.?)
- Multiline string literal parsing
- Slice types ([]T, [:s]T) and array types ([N]T, [N:s]T)
- Fix comptime block main_token in parseContainerMembers

Fix zigData mapping in parser_test.zig:
- field_access, unwrap_optional use node_and_token (not node_and_node)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

parser.c

@@ -533,16 +533,67 @@ static AstNodeIndex parsePrimaryTypeExpr(Parser* p) {
 }
 
 static AstNodeIndex parseSuffixOp(Parser* p, AstNodeIndex lhs) {
-    (void)lhs;
     const TokenizerTag tok = p->token_tags[p->tok_i];
     switch (tok) {
-    case TOKEN_L_BRACKET:
+    case TOKEN_L_BRACKET: {
+        const AstTokenIndex lbracket = nextToken(p);
+        const AstNodeIndex index_expr = expectExpr(p);
+        switch (p->token_tags[p->tok_i]) {
+        case TOKEN_R_BRACKET:
+            p->tok_i++;
+            return addNode(&p->nodes,
+                (AstNodeItem) {
+                    .tag = AST_NODE_ARRAY_ACCESS,
+                    .main_token = lbracket,
+                    .data = { .lhs = lhs, .rhs = index_expr },
+                });
+        case TOKEN_ELLIPSIS2:
+            fprintf(stderr, "parseSuffixOp: slicing not implemented\n");
+            exit(1);
+        default:
+            fprintf(
+                stderr, "parseSuffixOp: expected ] or .. after index expr\n");
+            exit(1);
+        }
+        return 0; // tcc
+    }
     case TOKEN_PERIOD_ASTERISK:
     case TOKEN_INVALID_PERIODASTERISKS:
-    case TOKEN_PERIOD:
         fprintf(stderr, "parseSuffixOp does not support %s\n",
             tokenizerGetTagString(tok));
         exit(1);
+    case TOKEN_PERIOD:
+        if (p->token_tags[p->tok_i + 1] == TOKEN_IDENTIFIER) {
+            const AstTokenIndex dot = nextToken(p);
+            return addNode(&p->nodes,
+                (AstNodeItem) {
+                    .tag = AST_NODE_FIELD_ACCESS,
+                    .main_token = dot,
+                    .data = { .lhs = lhs, .rhs = nextToken(p) },
+                });
+        }
+        if (p->token_tags[p->tok_i + 1] == TOKEN_ASTERISK) {
+            const AstTokenIndex dot = nextToken(p);
+            nextToken(p); // consume the *
+            return addNode(&p->nodes,
+                (AstNodeItem) {
+                    .tag = AST_NODE_DEREF,
+                    .main_token = dot,
+                    .data = { .lhs = lhs, .rhs = 0 },
+                });
+        }
+        if (p->token_tags[p->tok_i + 1] == TOKEN_QUESTION_MARK) {
+            const AstTokenIndex dot = nextToken(p);
+            return addNode(&p->nodes,
+                (AstNodeItem) {
+                    .tag = AST_NODE_UNWRAP_OPTIONAL,
+                    .main_token = dot,
+                    .data = { .lhs = lhs, .rhs = nextToken(p) },
+                });
+        }
+        fprintf(stderr, "parseSuffixOp: unsupported period suffix\n");
+        exit(1);
+        return 0; // tcc
     default:
         return null_node;
     }
@@ -1521,13 +1572,13 @@ static Members parseContainerMembers(Parser* p) {
             // block/decl. Check if it's followed by a block (comptime { ...
             // }).
             if (p->token_tags[p->tok_i + 1] == TOKEN_L_BRACE) {
-                p->tok_i++;
+                const AstTokenIndex comptime_token = nextToken(p);
                 const AstNodeIndex block_node = parseBlock(p);
                 SLICE_APPEND(AstNodeIndex, &p->scratch,
                     addNode(&p->nodes,
                         (AstNodeItem) {
                             .tag = AST_NODE_COMPTIME,
-                            .main_token = p->tok_i - 1,
+                            .main_token = comptime_token,
                             .data = { .lhs = block_node, .rhs = 0 },
                         }));
                 trailing = p->token_tags[p->tok_i - 1] == TOKEN_R_BRACE;

parser_test.zig

@@ -234,8 +234,6 @@ fn zigData(tag: Ast.Node.Tag, lhs: u32, rhs: u32) Ast.Node.Data {
         .container_field_align,
         .error_union,
         .@"catch",
-        .field_access,
-        .unwrap_optional,
         .equal_equal,
         .bang_equal,
         .less_than,
@@ -378,6 +376,8 @@ fn zigData(tag: Ast.Node.Tag, lhs: u32, rhs: u32) Ast.Node.Data {
         // .node_and_token
         .grouped_expression,
         .asm_input,
+        .field_access,
+        .unwrap_optional,
         => .{ .node_and_token = .{ toIndex(lhs), rhs } },
 
         // .opt_node_and_token
@@ -599,3 +599,53 @@ test "zig fmt: respect line breaks in struct field value declaration" {
         \\
     );
 }
+
+test "zig fmt: respect line breaks before functions" {
+    try testCanonical(
+        \\const std = @import("std");
+        \\
+        \\inline fn foo() void {}
+        \\
+        \\noinline fn foo() void {}
+        \\
+        \\export fn foo() void {}
+        \\
+        \\extern fn foo() void;
+        \\
+        \\extern "foo" fn foo() void;
+        \\
+    );
+}
+
+test "zig fmt: simple top level comptime block" {
+    try testCanonical(
+        \\// line comment
+        \\comptime {}
+        \\
+    );
+}
+
+test "zig fmt: two spaced line comments before decl" {
+    try testCanonical(
+        \\// line comment
+        \\
+        \\// another
+        \\comptime {}
+        \\
+    );
+}
+
+test "zig fmt: respect line breaks after var declarations" {
+    try testCanonical(
+        \\const crc =
+        \\    lookup_tables[0][p[7]] ^
+        \\    lookup_tables[1][p[6]] ^
+        \\    lookup_tables[2][p[5]] ^
+        \\    lookup_tables[3][p[4]] ^
+        \\    lookup_tables[4][@as(u8, self.crc >> 24)] ^
+        \\    lookup_tables[5][@as(u8, self.crc >> 16)] ^
+        \\    lookup_tables[6][@as(u8, self.crc >> 8)] ^
+        \\    lookup_tables[7][@as(u8, self.crc >> 0)];
+        \\
+    );
+}