fix second pass of method application arguments (#6526)

## Description

This PR fixes #6487.

## Checklist

- [x] I have linked to any relevant issues.
- [x] I have commented my code, particularly in hard-to-understand
areas.
- [ ] I have updated the documentation where relevant (API docs, the
reference, and the Sway book).
- [ ] If my change requires substantial documentation changes, I have
[requested support from the DevRel
team](https://github.com/FuelLabs/devrel-requests/issues/new/choose)
- [x] I have added tests that prove my fix is effective or that my
feature works.
- [ ] I have added (or requested a maintainer to add) the necessary
`Breaking*` or `New Feature` labels where relevant.
- [x] I have done my best to ensure that my PR adheres to [the Fuel Labs
Code Review
Standards](https://github.com/FuelLabs/rfcs/blob/master/text/code-standards/external-contributors.md).
- [x] I have requested a review from the relevant team or maintainers.

sway-core/src/language/ty/expression/expression_variant.rs

@@ -1007,7 +1007,9 @@ impl TypeCheckAnalysis for TyExpressionVariant {
     ) -> Result<(), ErrorEmitted> {
         match self {
             TyExpressionVariant::Literal(_) => {}
-            TyExpressionVariant::FunctionApplication { fn_ref, .. } => {
+            TyExpressionVariant::FunctionApplication {
+                fn_ref, arguments, ..
+            } => {
                 let fn_decl_id = ctx.get_normalized_fn_node_id(fn_ref.id());
 
                 let fn_node = ctx.get_node_for_fn_decl(&fn_decl_id);
@@ -1021,6 +1023,22 @@ impl TypeCheckAnalysis for TyExpressionVariant {
                         let _ = fn_decl_id.type_check_analyze(handler, ctx);
                     }
                 }
+
+                // Unify arguments that are still not concrete
+                let decl = ctx.engines.de().get(fn_ref.id());
+
+                use crate::type_system::unify::unifier::*;
+                let unifier = Unifier::new(ctx.engines, "", UnifyKind::Default);
+
+                for (decl_param, arg) in decl.parameters.iter().zip(arguments.iter()) {
+                    unifier.unify(
+                        handler,
+                        arg.1.return_type,
+                        decl_param.type_argument.type_id,
+                        &Span::dummy(),
+                        false,
+                    );
+                }
             }
             TyExpressionVariant::LazyOperator { lhs, rhs, .. } => {
                 lhs.type_check_analyze(handler, ctx)?;

sway-core/src/semantic_analysis/ast_node/expression/typed_expression/method_application.rs

@@ -52,18 +52,7 @@ pub(crate) fn type_check_method_application(
         let arg_handler = Handler::default();
         let arg_opt = ty::TyExpression::type_check(&arg_handler, ctx, arg).ok();
 
-        // Check this type needs a second pass
-        let has_errors = arg_handler.has_errors();
-        let is_not_concrete = arg_opt
-            .as_ref()
-            .map(|x| {
-                x.return_type
-                    .extract_inner_types(engines, IncludeSelf::Yes)
-                    .iter()
-                    .any(|x| !x.is_concrete(engines, TreatNumericAs::Abstract))
-            })
-            .unwrap_or_default();
-        let needs_second_pass = has_errors || is_not_concrete;
+        let needs_second_pass = arg_handler.has_errors();
 
         if index == 0 {
             // We want to emit errors in the self parameter and ignore TraitConstraintNotSatisfied with Placeholder

test/src/e2e_vm_tests/test_programs/should_pass/language/generic_impl_self/Forc.lock

@@ -1,13 +1,16 @@
 [[package]]
-name = 'core'
-source = 'path+from-root-DA3FEDB2AB26E552'
+name = "core"
+source = "path+from-root-DA3FEDB2AB26E552"
 
 [[package]]
-name = 'generic_impl_self'
-source = 'member'
-dependencies = ['std']
+name = "generic_impl_self"
+source = "member"
+dependencies = [
+    "core",
+    "std",
+]
 
 [[package]]
-name = 'std'
-source = 'path+from-root-DA3FEDB2AB26E552'
-dependencies = ['core']
+name = "std"
+source = "path+from-root-DA3FEDB2AB26E552"
+dependencies = ["core"]

test/src/e2e_vm_tests/test_programs/should_pass/language/generic_impl_self/Forc.toml

@@ -5,4 +5,5 @@ name = "generic_impl_self"
 entry = "main.sw"
 
 [dependencies]
+core = { path = "../../../../../../../sway-lib-core" }
 std = { path = "../../../../../../../sway-lib-std" }

test/src/e2e_vm_tests/test_programs/should_pass/language/generic_impl_self/src/main.sw

@@ -212,9 +212,23 @@ fn generic_impl_self_test() {
     assert(u.first.value + u.second.value == 7u8);
 }
 
+use std::vec::*;
+
+impl<T> Vec<T> {
+    pub fn with(self, with_value: T) -> Self {
+        let mut inside_vec = self;
+        inside_vec.push(with_value);
+        inside_vec
+    }
+}
+
 fn main() -> u32 {
     generic_impl_self_test();
     result_impl_test();
 
+    // data must be Vec<u256>
+    let data = Vec::new().with(0x333u256).with(0x222u256);
+    assert(data.len() == 2);
+
     10u32
 }