fixed parsing

.vscode/tasks.json

+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558
+    // for the documentation about the tasks.json format
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "cargo run --example main",
+            "type": "shell",
+            "command": "cargo run --example main",
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            }
+        },
+        {
+            "label": "cargo run --example trust",
+            "type": "shell",
+            "command": "cargo run --example trust",
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            },
+            "problemMatcher": [
+                "$rustc"
+            ]
+        }
+    ]
+}
\ No newline at end of file

Cargo.lock

+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "proc-collect"
+version = "0.1.0"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3acb317c6ff86a4e579dfa00fc5e6cca91ecbb4e7eb2df0468805b674eb88548"
+dependencies = [
+ "unicode-xid",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "053a8c8bcc71fcce321828dc897a98ab9760bef03a4fc36693c231e5b3216cfe"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "af6f3550d8dff9ef7dc34d384ac6f107e5d31c8f57d9f28e0081503f547ac8f5"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
+[[package]]
+name = "unicode-xid"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "826e7639553986605ec5979c7dd957c7895e93eabed50ab2ffa7f6128a75097c"

Cargo.toml

+[package]
+name = "proc-collect"
+version = "0.1.0"
+authors = ["pln <Per Lindgren>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[lib]
+proc-macro = true
+
+[dependencies]
+quote = "1.0.2"
+proc-macro2 = "1.0"
+
+[dependencies.syn]
+version = "1.0.14"
+features = ["full", "extra-traits"]
+

examples/trust.rs

+use proc_collect::*;
+
+#[trust]
+mod kalleanka {
+    fn hello() {
+        ext_hello();
+    }
+
+    #[entry]
+    fn entry() {}
+
+    #[interrupt]
+    fn interrupt() {}
+
+    #[exception]
+    fn exception() {}
+}
+
+fn ext_hello() {
+    println!("hello");
+}
+fn main() {
+    hello();
+}

src/lib.rs

+extern crate proc_macro;
+
+use proc_macro::TokenStream;
+use quote::{quote, ToTokens, TokenStreamExt};
+use std::fs::{File, OpenOptions};
+use std::io::prelude::*;
+use std::iter::FromIterator;
+use syn::parse::{Parse, ParseStream};
+use syn::{parse_macro_input, Attribute, Ident, Item, ItemMod, Result, Token};
+// use syn::{parse_macro_input, Attribute, Ident, ItemMod, Result, Token};
+
+
+#[proc_macro_attribute]
+pub fn entry(_args: TokenStream, input: TokenStream) -> TokenStream {
+    let items = parse_macro_input!(input as FnItem).items;
+    (quote! { #(#items)* }).into()
+}
+
+#[proc_macro_attribute]
+pub fn interrupt(_args: TokenStream, input: TokenStream) -> TokenStream {
+    input
+}
+
+#[proc_macro_attribute]
+pub fn exception(_args: TokenStream, input: TokenStream) -> TokenStream {
+    input
+}
+
+#[derive(Debug)]
+struct TrustMod {
+    items: Vec<Item>,
+}
+
+impl Parse for TrustMod {
+    fn parse(input: ParseStream) -> Result<Self> {
+        let module: ItemMod = input.parse()?;
+        match module.content {
+            Some((_, items)) => Ok(TrustMod { items }),
+            _ => panic!("illegal trust module"),
+        }
+    }
+}
+
+#[proc_macro_attribute]
+pub fn trust(_args: TokenStream, input: TokenStream) -> TokenStream {
+    let items = parse_macro_input!(input as TrustMod).items;
+    (quote! { #(#items)* }).into()
+}