std json parser

examples/chip8.zr

@@ -52,7 +52,7 @@ func CHIP8.free[c: CHIP8] : void
     c->keyboard->free()
     c->display->free()
     c->keyboard_map->free()
-    mem.free(c)
+    (c as ptr)->free()
 
 func CHIP8.disassemble[c: CHIP8, ins_count: i64] : void
     for i in 0..ins_count
@@ -291,7 +291,7 @@ func main[argc: i64, argv: ptr] : i64
     c := new CHIP8
     c->init()
 
-    ~buffer, ok := io.read_binary_file(path)
+    buffer, ok := io.read_binary_file(path)
     if !ok
         panic("failed to read file")
 

examples/curl.zr

@@ -12,7 +12,7 @@ func main[argc: i64, argv: ptr] : i64
         io.println("ERROR: invalid url (Did you forget \"http://\"?)")
         return 1
 
-    if !url->substr(0, 7)->equal("http://")
+    if !url->substr_n(0, 7)->equal("http://")
         io.println("ERROR: only http scheme is supported")
         return 1
     
@@ -24,23 +24,19 @@ func main[argc: i64, argv: ptr] : i64
             break
         i += 1
 
-    host := url->substr(host_start, i - host_start)
+    host := url->substr_n(host_start, i - host_start)
     path := "/"
     if i < url_len
-        path = url->substr(i, url_len - i)
+        path = url->substr_n(i, url_len - i)
     
-    ~s, ok := net.connect(host, 80)
+    s, ok := net.connect(host, 80)
     if !ok
         panic("failed to connect")
 
-    req := new str.Builder
+    // seems reasonable
-    req->append("GET ")
+    req := _stackalloc(4096)
-    req->append(path)
+    req_size := str.format_into(req as str, 4096, "GET %s HTTP/1.0\r\nHost: %s\r\nConnection: close\r\n\r\n", path, host)
-    req->append(" HTTP/1.0\r\nHost: ")
+    net.send(s, req, req_size)
-    req->append(host)
-    req->append("\r\nConnection: close\r\n\r\n")
-    net.send(s, req->data, req->size)
-    req->destroy()
 
     header_buf := mem.alloc(8192) as str
     header_size := 0

examples/euler/euler_13.zr

@@ -2,4 +2,4 @@ include "std/io.zr"
 
 func main[] : i64
     n := 37107287533 + 46376937677 + 74324986199 + 91942213363 + 23067588207 + 89261670696 + 28112879812 + 44274228917 + 47451445736 + 70386486105 + 62176457141 + 64906352462 + 92575867718 + 58203565325 + 80181199384 + 35398664372 + 86515506006 + 71693888707 + 54370070576 + 53282654108 + 36123272525 + 45876576172 + 17423706905 + 81142660418 + 51934325451 + 62467221648 + 15732444386 + 55037687525 + 18336384825 + 80386287592 + 78182833757 + 16726320100 + 48403098129 + 87086987551 + 59959406895 + 69793950679 + 41052684708 + 65378607361 + 35829035317 + 94953759765 + 88902802571 + 25267680276 + 36270218540 + 24074486908 + 91430288197 + 34413065578 + 23053081172 + 11487696932 + 63783299490 + 67720186971 + 95548255300 + 76085327132 + 37774242535 + 23701913275 + 29798860272 + 18495701454 + 38298203783 + 34829543829 + 40957953066 + 29746152185 + 41698116222 + 62467957194 + 23189706772 + 86188088225 + 11306739708 + 82959174767 + 97623331044 + 42846280183 + 55121603546 + 32238195734 + 75506164965 + 62177842752 + 32924185707 + 99518671430 + 73267460800 + 76841822524 + 97142617910 + 87783646182 + 10848802521 + 71329612474 + 62184073572 + 66627891981 + 60661826293 + 85786944089 + 66024396409 + 64913982680 + 16730939319 + 94809377245 + 78639167021 + 15368713711 + 40789923115 + 44889911501 + 41503128880 + 81234880673 + 82616570773 + 22918802058 + 77158542502 + 72107838435 + 20849603980 + 53503534226
-    io.println(n->to_str()->substr(0, 10))
+    io.println(n->to_str()->substr_n(0, 10))

examples/hello.zr

@@ -1,4 +0,0 @@
-include "std/io.zr"
-
-func main[] : i64
-    io.println("Hello, World!")

examples/quicksort.zr

@@ -1,18 +0,0 @@
-include "std/io.zr"
-include "std/os.zr"
-
-func main[] : i64
-    arr := []
-    for i in 0..10
-        arr->push(os.urandom_i64()->abs() % 1000)
-
-    for i in 0..arr->size
-        io.println_i64(arr->nth(i))
-    io.println("------------")
-
-    arr->quicksort()
-
-    for i in 0..arr->size
-        io.println_i64(arr->nth(i))
-
-    arr->free()

examples/tcp_server.zr

@@ -2,7 +2,7 @@ include "std/io.zr"
 include "std/net.zr"
 
 func main[] : i64
-    ~s, ok := net.listen("127.0.0.1", 8000)
+    s, ok := net.listen("127.0.0.1", 8000)
     if !ok
         panic("failed to listen")
 

examples/udp_server.zr

@@ -2,7 +2,7 @@ include "std/io.zr"
 include "std/net.zr"
 
 func main[] : i64
-    ~s, ok := net.create_udp_server("127.0.0.1", 8000)
+    s, ok := net.create_udp_server("127.0.0.1", 8000)
     if !ok
         panic("net.create_udp_server failed")
 

src/codegen_x86_64.rs

@@ -812,7 +812,6 @@ _builtin_environ:
                 if *use_heap {
                     emit!(&mut self.output, "    mov rdi, {}", memory_size);
                     emit!(&mut self.output, "    call mem.alloc");
-                    emit!(&mut self.output, "    push rax");
                 } else {
                     let aligned_size = (memory_size + 15) & !15;
                     emit!(&mut self.output, "    sub rsp, {}", aligned_size);

src/parser.rs

@@ -342,7 +342,7 @@ impl Parser {
             Ok(Stmt::Break)
         } else if self.match_token(&[TokenType::KeywordContinue]) {
             Ok(Stmt::Continue)
-        } else if self.match_token(&[TokenType::Tilde]) {
+        } else if self.check(&TokenType::Identifier) && self.check_ahead(&TokenType::Comma) {
             let mut targets = vec![];
             loop {
                 targets.push(self.consume(Identifier, "expected an identifier")?);

src/tokenizer.rs

@@ -30,7 +30,6 @@ pub enum TokenType {
     ShiftLeft,
     ShiftRight,
     Arrow,
-    Tilde,
 
     Equal,
     DoubleEqual,
@@ -179,7 +178,6 @@ impl<'a> Tokenizer<'a> {
             '%' => self.add_token(TokenType::Mod)?,
             '^' => self.add_token(TokenType::Xor)?,
             ':' => self.add_token(TokenType::Colon)?,
-            '~' => self.add_token(TokenType::Tilde)?,
             '-' => {
                 if self.match_char('=') {
                     self.add_token(TokenType::MinusEqual)?

src/typechecker.rs

@@ -596,6 +596,15 @@ impl<'a> TypeChecker<'a> {
 
                 match &func_type.params {
                     FnParams::Normal(params) => {
+                        if params.is_empty() || params[0] != receiver_type {
+                            return error!(
+                                method.loc,
+                                format!(
+                                    "first parameter of the method must be of type {}",
+                                    receiver_type
+                                )
+                            );
+                        }
                         if params.len() != args.len() + 1 {
                             return error!(
                                 method.loc,
@@ -606,15 +615,6 @@ impl<'a> TypeChecker<'a> {
                                 )
                             );
                         }
-                        if params[0] != receiver_type {
-                            return error!(
-                                method.loc,
-                                format!(
-                                    "first parameter of the method must be of type {}",
-                                    receiver_type
-                                )
-                            );
-                        }
                         for (i, arg) in args.iter().enumerate() {
                             expect_type!(self.typecheck_expr(env, arg)?, params[i + 1], method.loc);
                         }

std/containers.zr

@@ -38,14 +38,14 @@ func Array.push[xs: Array, x: any] : void
 func Array.free[xs: Array] : void
     if xs->data != 0
         xs->data->free()
-    mem.free(xs)
+    (xs as ptr)->free()
 
 func Array.free_with_items[xs: Array] : void
     if xs->data != 0
         for i in 0..xs->size
-            mem.free(xs->nth(i))
+            (xs->nth(i) as ptr)->free()
         xs->data->free()
-    mem.free(xs)
+    (xs as ptr)->free()
 
 func Array.pop[xs: Array] : any
     if xs->size == 0
@@ -137,7 +137,7 @@ func str.split[haystack: str, needle: str]: Array
             return result
         else
             for i in 0..haystack_len
-                result->push(haystack->substr(i, 1))
+                result->push(haystack->substr_n(i, 1))
             return result
 
     start := 0
@@ -150,13 +150,13 @@ func str.split[haystack: str, needle: str]: Array
                     match = false
                     break
             if match
-                result->push(haystack->substr(start, i - start))
+                result->push(haystack->substr_n(start, i - start))
                 start = i + needle_len
                 i += needle_len
                 continue
         i += 1
 
-    result->push(haystack->substr(start, haystack_len - start))
+    result->push(haystack->substr_n(start, haystack_len - start))
     return result
 
 const HashMap._TABLE_SIZE = 100
@@ -214,27 +214,36 @@ func HashMap.delete[map: HashMap, key: str] : void
                 map->table->set(index, current->next)
             
             current->key->free()
-            mem.free(current)
+            (current as ptr)->free()
             return
 
         prev = current
         current = current->next
 
+func HashMap.keys[map: HashMap] : Array
+    out := []
+    for i in 0..HashMap._TABLE_SIZE
+        current : HashMap._Node = map->table->nth(i)
+        while current as ptr
+            out->push(current->key)
+            current = current->next
+    return out
+
+func HashMap.free_with_keys[map: HashMap] : void
+    for i in 0..HashMap._TABLE_SIZE
+        current : HashMap._Node = map->table->nth(i)
+        while current as ptr
+            tmp := current
+            current = current->next
+            tmp->key->free()
+            (tmp as ptr)->free()
+
+    map->table->free()
+    (map as ptr)->free()
+
 func HashMap._djb2[key: str] : i64
     hash := 5381 
     for i in 0..key->len()
         hash = ((hash << 5) + hash) + key[i]
     hash = (hash & 0x7fffffffffffffff) // prevent negative
     return hash % HashMap._TABLE_SIZE
-
-func HashMap.free[map: HashMap] : void
-    for i in 0..HashMap._TABLE_SIZE
-        current : HashMap._Node = map->table->nth(i)
-        while current as ptr
-            tmp := current
-            current = current->next
-            tmp->key->free()
-            mem.free(tmp)
-
-    map->table->free()
-    mem.free(map)

std/io.zr

@@ -85,9 +85,7 @@ func io.read_line[] : str
         if c == '\n'
             break
         b->append_char(c)
-    s := b->build()
+    return b->build_and_free_buffer()
-    b->destroy()
-    return s
 
 func io.read_text_file[path: str] : str, bool
     fd := _builtin_syscall(SYS_openat, AT_FDCWD, path, O_RDONLY, 0)

std/json.zr

@@ -0,0 +1,200 @@
+include "std/containers.zr"
+
+const JSON_OBJECT = 0
+const JSON_ARRAY  = 1
+const JSON_STRING = 2
+const JSON_NUMBER = 3
+const JSON_NULL   = 4
+const JSON_BOOL   = 5
+
+struct json.Value
+    type: i64
+    value: any
+
+func json.Value.dump[v: json.Value] : str
+    s := new str.Builder
+
+    if v->type == JSON_OBJECT
+        map := v->value as HashMap
+        keys := map->keys()
+        s->append_char('{')
+        for i in 0..keys->size
+            if i > 0
+                s->append_char(',')
+            s->append_char('"')
+            s->append(keys->nth(i) as str)
+            s->append_char('"')
+            s->append_char(':')
+            value, _ := map->get(keys->nth(i) as str)
+            s->append((value as json.Value)->dump())
+        s->append_char('}')
+        keys->free()
+    else if v->type == JSON_ARRAY
+        arr := v->value as Array
+        s->append_char('[')
+        for i in 0..arr->size
+            if i > 0
+                s->append_char(',')
+            s->append((arr->nth(i) as json.Value)->dump())
+        s->append_char(']')
+    else if v->type == JSON_STRING
+        // TODO: escape sequences
+        s->append_char('"')
+        s->append(v->value as str)
+        s->append_char('"')
+    else if v->type == JSON_NUMBER
+        s->append((v->value as i64)->to_str())
+    else if v->type == JSON_NULL
+        s->append("null")
+    else if v->type == JSON_BOOL
+        if v->value as bool
+            s->append("true")
+        else
+            s->append("false")
+    else
+        panic("json.Value.dump: unknown value type")
+    
+    return s->build_and_free_buffer()
+
+func json.Value.free[v: json.Value] : void
+    if v->type == JSON_OBJECT
+        map := v->value as HashMap
+        keys := map->keys()
+        for i in 0..keys->size
+            value, _ := map->get(keys->nth(i) as str)
+            (value as json.Value)->free()
+        keys->free()
+        
+        map->free_with_keys()
+    else if v->type == JSON_ARRAY
+        arr := v->value as Array
+        for i in 0..arr->size
+            (arr->nth(i) as json.Value)->free()
+        arr->free()
+    else if v->type == JSON_STRING
+        (v->value as str)->free()
+
+    (v as ptr)->free()
+
+func json.parse[s: str] : json.Value
+    i := 0
+    return json._parse_value(s, ^i)
+
+func json._parse_value[s: str, i: ptr] : json.Value
+    out := new* json.Value
+
+    json._skip_whitespace(s, i)
+
+    if s[mem.read64(i)] == 0
+        panic("json.parse: unexpected EOF")
+    
+    if s[mem.read64(i)] == '{'
+        mem.write64(i, mem.read64(i) + 1)
+        json._skip_whitespace(s, i)
+
+        out->type = JSON_OBJECT
+        out->value = HashMap.new()
+        
+        if s[mem.read64(i)] != '}'
+            while true
+                json._skip_whitespace(s, i)
+                key := json._parse_string(s, i)
+                json._skip_whitespace(s, i)
+
+                if s[mem.read64(i)] != ':'
+                    panic("json.parse: expected ':'")
+                mem.write64(i, mem.read64(i) + 1)
+                json._skip_whitespace(s, i)
+
+                value := json._parse_value(s, i)
+                (out->value as HashMap)->insert(key, value)
+                key->free()
+
+                json._skip_whitespace(s, i)
+                if s[mem.read64(i)] == ','
+                    mem.write64(i, mem.read64(i) + 1)
+                else
+                    break
+        
+        json._skip_whitespace(s, i)
+        if s[mem.read64(i)] != '}'
+            panic("json.parse: expected '}'")
+        mem.write64(i, mem.read64(i) + 1)
+    else if s[mem.read64(i)] == '['
+        mem.write64(i, mem.read64(i) + 1)
+        json._skip_whitespace(s, i)
+
+        out->type = JSON_ARRAY
+        out->value = []
+        
+        while s[mem.read64(i)] != ']'
+            json._skip_whitespace(s, i)
+
+            (out->value as Array)->push(json._parse_value(s, i))
+            json._skip_whitespace(s, i)
+
+            if s[mem.read64(i)] == ','
+                mem.write64(i, mem.read64(i) + 1)
+            else
+                break
+        
+        json._skip_whitespace(s, i)
+        if s[mem.read64(i)] != ']'
+            panic("json.parse: expected ']'")
+        mem.write64(i, mem.read64(i) + 1)
+    else if s[mem.read64(i)] == '"'
+        out->type = JSON_STRING
+        out->value = json._parse_string(s, i)
+    else if s[mem.read64(i)]->is_digit() || s[mem.read64(i)] == '-'
+        start := mem.read64(i)
+
+        if s[mem.read64(i)] == '-'
+            mem.write64(i, mem.read64(i) + 1)
+
+        while s[mem.read64(i)]->is_digit()
+            mem.write64(i, mem.read64(i) + 1)
+        // TODO: float support once str.parse_f64 is a thing
+        if s[mem.read64(i)] == '.'
+            panic("json.parse: parsing floats not implemented yet")
+
+        len := mem.read64(i) - start
+
+        num_str := s->substr_n(start, len)
+        out->type = JSON_NUMBER
+        out->value = num_str->parse_i64()
+        num_str->free()
+    else if s[mem.read64(i)] == 'n' && s[mem.read64(i)+1] == 'u' && s[mem.read64(i)+2] == 'l' && s[mem.read64(i)+3] == 'l'
+        out->type = JSON_NULL
+        mem.write64(i, mem.read64(i) + 4)
+    else if s[mem.read64(i)] == 't' && s[mem.read64(i)+1] == 'r' && s[mem.read64(i)+2] == 'u' && s[mem.read64(i)+3] == 'e'
+        out->type = JSON_BOOL
+        out->value = true
+        mem.write64(i, mem.read64(i) + 4)
+    else if s[mem.read64(i)] == 'f' && s[mem.read64(i)+1] == 'a' && s[mem.read64(i)+2] == 'l' && s[mem.read64(i)+3] == 's' && s[mem.read64(i)+4] == 'e'
+        out->type = JSON_BOOL
+        out->value = false
+        mem.write64(i, mem.read64(i) + 5)
+    else
+        panic("json.parse: unexpected character")
+
+    return out
+
+func json._parse_string[s: str, i: ptr] : str
+    if s[mem.read64(i)] != '"'
+        panic("json.parse: expected '\"'")
+    mem.write64(i, mem.read64(i) + 1)
+
+    start := mem.read64(i)
+    // TODO: escape sequences
+    while s[mem.read64(i)] != '"'
+        if s[mem.read64(i)] == 0
+            panic("json.parse: unexpected EOF")
+        mem.write64(i, mem.read64(i) + 1)
+
+    len := mem.read64(i) - start
+    mem.write64(i, mem.read64(i) + 1)
+    return s->substr_n(start, len)
+
+func json._skip_whitespace[s: str, i: ptr] : void
+    while s[mem.read64(i)]->is_whitespace()
+        mem.write64(i, mem.read64(i) + 1)

std/mem.zr

@@ -72,9 +72,6 @@ func mem.alloc[size: i64] : ptr
     
     return blk as ptr + MEM_BLOCK_SIZE
 
-func mem.free[x: any] : void
-    ptr.free(x as ptr)
-
 func ptr.free[x: ptr] : void
     if x == 0
         return
@@ -237,4 +234,4 @@ func Blob.alloc[size: i64] : Blob
 
 func Blob.free[buf: Blob] : void
     buf->data->free()
-    mem.free(buf)
+    (buf as ptr)->free()

std/net.zr

@@ -22,7 +22,7 @@ func net.listen[host: str, port: i64] : i64, bool
         _builtin_syscall(SYS_close, s)
         return -1, false
     
-    ~packed_host, ok := net.resolve(host)
+    packed_host, ok := net.resolve(host)
     if !ok
         return -1, false
 
@@ -44,7 +44,7 @@ func net.connect[host: str, port: i64] : i64, bool
     if s < 0
         return -1, false
     
-    ~packed_host, ok := net.resolve(host)
+    packed_host, ok := net.resolve(host)
     if !ok
         return -1, false
 
@@ -101,18 +101,18 @@ func net.UDPSocket.receive[s: net.UDPSocket, size: i64] : net.UDPPacket
 func net.UDPSocket.close_and_free[s: net.UDPSocket] : void
     _builtin_syscall(SYS_close, s->fd)
     s->addr->free()
-    mem.free(s)
+    (s as ptr)->free()
 
 func net.create_udp_client[host: str, port: i64] : net.UDPSocket, bool
     s := new* net.UDPSocket
 
-    ~packed_host, ok := net.resolve(host)
+    packed_host, ok := net.resolve(host)
     if !ok
         return 0 as net.UDPSocket, false
 
     s->fd = _builtin_syscall(SYS_socket, AF_INET, SOCK_DGRAM, 0)
     if s->fd < 0
-        mem.free(s)
+        (s as ptr)->free()
         return 0 as net.UDPSocket, false
 
     s->addr = mem.alloc(16)
@@ -120,7 +120,7 @@ func net.create_udp_client[host: str, port: i64] : net.UDPSocket, bool
     return s, true
 
 func net.create_udp_server[host: str, port: i64] : net.UDPSocket, bool
-    ~s, ok := net.create_udp_client(host, port)
+    s, ok := net.create_udp_client(host, port)
     if !ok
         return 0 as net.UDPSocket, false
 
@@ -141,7 +141,7 @@ struct net.UDPPacket
 func net.UDPPacket.free[pkt: net.UDPPacket] : void
     pkt->data->free()
     pkt->source_addr->free()
-    mem.free(pkt)
+    (pkt as ptr)->free()
 
 func net.resolve[domain: str] : i64, bool
     // if domain is already an ip, skip dns resolution
@@ -172,7 +172,7 @@ func net.resolve[domain: str] : i64, bool
     query := net.build_dns_query(domain, DNS_TYPE_A)
 
     // TODO: this probably shouldnt be hardcoded
-    ~s, ok := net.create_udp_client("1.1.1.1", 53)
+    s, ok := net.create_udp_client("1.1.1.1", 53)
     if !ok
         query->free()
         return -1, false

std/os.zr

@@ -9,7 +9,7 @@ func os.exit[code: i64] : void
 func os.getpid[] : i64
     return _builtin_syscall(SYS_getpid)
 
-func os.getenv[name: str] : str
+func os.getenv[name: str] : str, bool
     name_len := name->len()
     i := 0
     while true
@@ -17,15 +17,24 @@ func os.getenv[name: str] : str
         if entry as ptr == 0
             break
         if entry->equal_n(name, name_len) && entry[name_len] == '='
-            return (entry as ptr + name_len + 1) as str
+            return (entry as ptr + name_len + 1) as str, true
         i += 1
-    return ""
+    return 0 as str, false
 
 func os.basename[path: str] : str
-    i := path->len() - 1
+    len := path->len()
+    end := len
+    while end > 0 && path[end - 1] == '/'
+        end -= 1
+
+    if end == 0
+        return "/"
+
+    i := end - 1
     while i >= 0 && path[i] != '/'
         i -= 1
-    return path->substr(i + 1, path->len() - i - 1)
+
+    return path->substr_n(i + 1, end - i - 1)
 
 struct os.Timespec
     tv_sec: i64

std/str.zr

@@ -29,7 +29,7 @@ func u8.to_str[c: u8] : str
     return s
 
 func str.free[s: str] : void
-    mem.free(s)
+    (s as ptr)->free()
 
 func str.len[s: str] : i64
     i := 0
@@ -103,7 +103,7 @@ func str.format_into[..] : i64
                 n += 1
                 i += 1
             else if s[0] == 'f'
-                // TODO: fix when we implement f64 params
+                // TODO: use arrow when we implement f64 params
                 f64.to_str_buf(_var_arg(i), tmp as ptr)
                 tmp_len := tmp->len()
                 remaining := size - n - 1
@@ -166,7 +166,7 @@ func str.find[haystack: str, needle: str] : i64
             return i
     return -1
 
-func str.substr[s: str, start: i64, length: i64] : str
+func str.substr_n[s: str, start: i64, length: i64] : str
     out := mem.alloc(length + 1) as str
     mem.copy(s as ptr + start, out as ptr, length)
     out[length] = 0
@@ -188,7 +188,7 @@ func str.trim[s: str] : str
     while end >= start && s[end]->is_whitespace()
         end -= 1
 
-    return s->substr(start, end - start + 1)
+    return s->substr_n(start, end - start + 1)
 
 func str.reverse[s: str] : str
     len := s->len()
@@ -286,7 +286,12 @@ func str.Builder.build[b: str.Builder] : str
     s[b->size] = 0
     return s
 
-func str.Builder.destroy[b: str.Builder] : void
+func str.Builder.build_and_free_buffer[b: str.Builder] : str
+    s := b->build()
+    b->free_buffer()
+    return s
+
+func str.Builder.free_buffer[b: str.Builder] : void
     if b->data != 0
         b->data->free()
     b->size = 0

test.zr

@@ -8,7 +8,7 @@ struct TestRunner
     custom_run_args: HashMap
 
 func TestRunner.run_directory[tr: TestRunner, dir: str] : void
-    ~files, ok := os.list_directory(dir)
+    files, ok := os.list_directory(dir)
     if !ok
         panic("failed to open test directory")
     for i in 0..files->size
@@ -28,12 +28,12 @@ func TestRunner.run_test[tr: TestRunner, x: str] : void
     io.printf("Building %s...\n", x)
 
     build_cmd := "./target/release/zern "->concat(x)
-    ~custom_build_flags, ok := tr->custom_build_flags->get(name)
+    custom_build_flags, ok := tr->custom_build_flags->get(name)
     if ok
         build_cmd = build_cmd->concat(" ")->concat(custom_build_flags)
 
     build_start_time := os.time()
-    ~status, ok := os.run_shell_command(build_cmd)
+    status, ok := os.run_shell_command(build_cmd)
     if !ok || status != 0
         os.exit(1)
     build_end_time := os.time()
@@ -47,12 +47,12 @@ func TestRunner.run_test[tr: TestRunner, x: str] : void
     io.printf("Running %s...\n", x)
 
     run_cmd := "./out"
-    ~custom_run_args, ok := tr->custom_run_args->get(name)
+    custom_run_args, ok := tr->custom_run_args->get(name)
     if ok
         run_cmd = run_cmd->concat(" ")->concat(custom_run_args)
 
     run_start_time := os.time()
-    ~status, ok := os.run_shell_command(run_cmd)
+    status, ok := os.run_shell_command(run_cmd)
     if !ok || status != 0
         io.println("Test failed.")
         os.exit(1)
@@ -61,7 +61,7 @@ func TestRunner.run_test[tr: TestRunner, x: str] : void
     io.printf("Running %s took %dms\n", x, run_end_time - run_start_time)
 
 func main[] : i64
-    ~status, ok := os.run_shell_command("cargo build --release")
+    status, ok := os.run_shell_command("cargo build --release")
     if !ok || status != 0
         os.exit(1)