fix(config): inline config intermingled

crates/config/src/inline/natspec.rs

@@ -189,13 +189,13 @@ impl SolangParser {
         }
 
         let Ok((pt, comments)) = solang_parser::parse(src, 0) else { return };
-        let mut prev_end = 0;
         for item in &pt.0 {
             let pt::SourceUnitPart::ContractDefinition(c) = item else { continue };
             let Some(id) = c.name.as_ref() else { continue };
             if id.name != contract_name {
                 continue
             };
+            let mut prev_end = c.loc.start();
             for part in &c.parts {
                 let pt::ContractPart::FunctionDefinition(f) = part else { continue };
                 let start = f.loc.start();
@@ -215,7 +215,6 @@ impl SolangParser {
                 }
                 prev_end = f.loc.end();
             }
-            prev_end = c.loc.end();
         }
     }
 }
@@ -401,4 +400,52 @@ contract FuzzInlineConf is DSTest {
             docs: conf.to_string(),
         }
     }
+
+    #[test]
+    fn parse_solang_multiple_contracts_from_same_file() {
+        let src = r#"
+// SPDX-License-Identifier: MIT OR Apache-2.0
+pragma solidity >=0.8.0;
+
+import "ds-test/test.sol";
+
+contract FuzzInlineConf is DSTest {
+     /// forge-config: default.fuzz.runs = 1
+    function testInlineConfFuzz1() {}
+}
+
+contract FuzzInlineConf2 is DSTest {
+    /// forge-config: default.fuzz.runs = 2
+    function testInlineConfFuzz2() {}
+}
+        "#;
+        let mut natspecs = vec![];
+        let solang = SolangParser::new();
+        let id = || "inline/FuzzInlineConf.t.sol:FuzzInlineConf".to_string();
+        let default_line = || "0:0:0".to_string();
+        solang.parse(&mut natspecs, src, &id(), "FuzzInlineConf");
+        assert_eq!(
+            natspecs,
+            [NatSpec {
+                contract: id(),
+                function: "testInlineConfFuzz1".to_string(),
+                line: default_line(),
+                docs: "forge-config: default.fuzz.runs = 1".to_string(),
+            },]
+        );
+
+        let mut natspecs = vec![];
+        let id = || "inline/FuzzInlineConf2.t.sol:FuzzInlineConf2".to_string();
+        solang.parse(&mut natspecs, src, &id(), "FuzzInlineConf2");
+        assert_eq!(
+            natspecs,
+            [NatSpec {
+                contract: id(),
+                function: "testInlineConfFuzz2".to_string(),
+                line: default_line(),
+                // should not get config from previous contract
+                docs: "forge-config: default.fuzz.runs = 2".to_string(),
+            },]
+        );
+    }
 }