diff --git a/hblang/README.md b/hblang/README.md
index 9a1a5cf..ef71bec 100644
--- a/hblang/README.md
+++ b/hblang/README.md
@@ -228,24 +228,30 @@ note: values of global variables are evaluated at compile time
 
 #### directives
 ```hb
-Type := struct {
-	brah: int,
-	blah: int,
-}
+foo := @use("foo.hb");
 
 main := fn(): int {
 	byte := @as(u8, 10);
 	same_type_as_byte := @as(@TypeOf(byte), 30);
 	wide_uint := @as(u32, 40);
 	truncated_uint := @as(u8, @intcast(wide_uint));
-	size_of_Type_in_bytes := @sizeof(Type);
-	align_of_Type_in_bytes := @alignof(Type);
+	size_of_Type_in_bytes := @sizeof(foo.Type);
+	align_of_Type_in_bytes := @alignof(foo.Type);
 	hardcoded_pointer := @as(^u8, @bitcast(10));
-	ecall_that_returns_int := @eca(int, 1, Type.(10, 20), 5, 6);
+	ecall_that_returns_int := @eca(int, 1, foo.Type.(10, 20), 5, 6);
 	return 0;
 }
+
+// in module: foo.hb
+
+Type := struct {
+	brah: int,
+	blah: int,
+}
 ```
 
+- `@use(<string>)`: imports a module based of string, the string is passed to a loader that can be customized, default loader uses following syntax:
+	- `((rel:|)(<path>)|git:<git-addr>:<path>)`: `rel:` and `''` prefixes both mean module is located at `path` relavive to the current file, `git:` takes a git url without `https://` passed as `git-addr`, `path` then refers to file within the repository
 - `@TypeOf(<expr>)`: results into literal type of whatever the type of `<expr>` is, `<expr>` is not included in final binary
 - `@as(<ty>, <expr>)`: hint to the compiler that  `@TypeOf(<expr>) == <ty>`
 - `@intcast(<expr>)`: needs to be used when conversion of `@TypeOf(<expr>)` would loose precision (widening of integers is implicit)
@@ -255,7 +261,6 @@ main := fn(): int {
 
 #### c_strings
 ```hb
-
 str_len := fn(str: ^u8): int {
 	len := 0;
 	loop if *str == 0 break else {
@@ -275,6 +280,38 @@ main := fn(): int {
 }
 ```
 
+#### struct_patterns
+```hb
+.{ fib, fib_iter, Fiber } := @use("fibs.hb");
+
+main := fn(): int {
+	.{ a, b } := Fiber.{ a: 10, b: 10 };
+	return fib(a) - fib_iter(b);
+}
+
+// in module: fibs.hb
+
+Fiber := struct { a: u8, b: u8 };
+
+fib := fn(n: int): int if n < 2 {
+	return n;
+} else {
+	return fib(n - 1) + fib(n - 2);
+};
+
+fib_iter := fn(n: int): int {
+	a := 0;
+	b := 1;
+	loop if n == 0 break else {
+		c := a + b;
+		a = b;
+		b = c;
+		n -= 1;
+	}
+	return a;
+}
+```
+
 ### Incomplete Examples
 
 #### generic_types
diff --git a/hblang/command-help.txt b/hblang/command-help.txt
index 9850393..ce9ee5d 100644
--- a/hblang/command-help.txt
+++ b/hblang/command-help.txt
@@ -1,3 +1,4 @@
 --fmt - format all source files
 --fmt-current - format mentioned file
 	--fmt-stdout - dont write the formatted file but print it
+--threads <1...> - number of threads compiler can use [default: 1]
diff --git a/hblang/src/codegen.rs b/hblang/src/codegen.rs
index b5cb9f9..5eb3795 100644
--- a/hblang/src/codegen.rs
+++ b/hblang/src/codegen.rs
@@ -2841,7 +2841,8 @@ impl Codegen {
 mod tests {
     use {
         super::parser,
-        crate::{codegen::LoggedMem, log},
+        crate::{codegen::LoggedMem, log, parser::FileId},
+        std::io,
     };
 
     const README: &str = include_str!("../README.md");
@@ -2872,9 +2873,30 @@ mod tests {
 
         let input = find_block(input, ident);
 
-        let path = "test";
+        let mut module_map = Vec::new();
+        let mut last_start = 0;
+        let mut last_module_name = "test";
+        for (i, m) in input.match_indices("// in module: ") {
+            module_map.push((last_module_name, &input[last_start..i]));
+            let (module_name, _) = input[i + m.len()..].split_once('\n').unwrap();
+            last_module_name = module_name;
+            last_start = i + m.len() + module_name.len() + 1;
+        }
+        module_map.push((last_module_name, &input[last_start..]));
+
+        let loader = |path: &str, _: &str| {
+            module_map
+                .iter()
+                .position(|&(name, _)| name == path)
+                .map(|i| i as FileId)
+                .ok_or(io::Error::from(io::ErrorKind::NotFound))
+        };
+
         let mut codegen = super::Codegen {
-            files: vec![parser::Ast::new(path, input, &parser::no_loader)],
+            files: module_map
+                .iter()
+                .map(|&(path, content)| parser::Ast::new(path, content, &loader))
+                .collect(),
             ..Default::default()
         };
         codegen.generate();
@@ -2947,5 +2969,6 @@ mod tests {
         generic_types => README;
         generic_functions => README;
         c_strings => README;
+        struct_patterns => README;
     }
 }
diff --git a/hblang/src/main.rs b/hblang/src/main.rs
index 593035e..6065f66 100644
--- a/hblang/src/main.rs
+++ b/hblang/src/main.rs
@@ -1,3 +1,5 @@
+use std::num::NonZeroUsize;
+
 fn main() -> std::io::Result<()> {
     let args = std::env::args().collect::<Vec<_>>();
     let args = args.iter().map(String::as_str).collect::<Vec<_>>();
@@ -13,6 +15,12 @@ fn main() -> std::io::Result<()> {
         hblang::Options {
             fmt: args.contains(&"--fmt"),
             fmt_current: args.contains(&"--fmt-current"),
+            extra_threads: args
+                .iter()
+                .position(|&a| a == "--threads")
+                .map(|i| args[i + 1].parse::<NonZeroUsize>().expect("--threads expects integer"))
+                .map_or(1, NonZeroUsize::get)
+                - 1,
         },
         &mut std::io::stdout(),
     )
diff --git a/hblang/tests/codegen_tests_directives.txt b/hblang/tests/codegen_tests_directives.txt
index 831d048..871c629 100644
--- a/hblang/tests/codegen_tests_directives.txt
+++ b/hblang/tests/codegen_tests_directives.txt
@@ -1,4 +1,4 @@
 ev: Ecall
-code size: 235
+code size: 239
 ret: 0
 status: Ok(())
diff --git a/hblang/tests/codegen_tests_struct_patterns.txt b/hblang/tests/codegen_tests_struct_patterns.txt
new file mode 100644
index 0000000..05768a8
--- /dev/null
+++ b/hblang/tests/codegen_tests_struct_patterns.txt
@@ -0,0 +1,3 @@
+code size: 533
+ret: 0
+status: Ok(())