fix(compiler): Redeclare imports [LNG-344] (#1109)

aqua-src/antithesis.aqua

@@ -1,39 +1,8 @@
-aqua A
+aqua Main
 
-export streamTry, streamFor
+import someFunc from "import.aqua"
 
-service FailureSrv("failure"):
-    fail(msg: string)
+export someFunc
 
-func streamTry() -> i8:
-    on HOST_PEER_ID:
-        try:
-            stream: *i8
-            anotherStream = stream
-            stream <<- 1
-            anotherStream <<- 1
-            FailureSrv.fail("try")
-        catch e:
-            stream = *[88,88,88]
-            stream <<- 2
-            FailureSrv.fail("catch")
-        otherwise:
-            stream: *i8
-            stream <<- 3
-
-        stream: *i8
-        stream <<- 4
-
-    <- stream!
-
-service StreamService("test-service"):
-    store(numbers: []u32, n: u32)
-
-func callService(stream: *u32, n: u32):
-    stream <<- 1
-    StreamService.store(stream, n)
-
-func streamFor():
-    arr = [1,2,3,4,5]
-    for a <- arr:
-      callService(*[], a)
+func a() -> string:
+  <- "srrt"

aqua-src/import.aqua

@@ -1,6 +1,10 @@
-service GetStr("multiret-test"):
-    retStr(s: *string, a: *string)
+aqua Import declares someFunc
 
+service GetStr("multiret-test"):
+    retStr(s: []string, a: []string)
+
+func someFunc() -> string:
+    <- "some func call"
 
 func foo_wrapper():
     GetStr.retStr(nil, nil)

integration-tests/aqua/examples/redeclare/import.aqua

@@ -0,0 +1,4 @@
+aqua Import declares someFunc
+
+func someFunc() -> string:
+  <- "some func"

integration-tests/aqua/examples/redeclare/redeclare.aqua

@@ -0,0 +1,3 @@
+aqua Redeclare declares someFunc
+
+import someFunc from "import.aqua"

integration-tests/aqua/examples/redeclare/useDeclare.aqua

@@ -0,0 +1,5 @@
+aqua UseDeclare declares someFunc
+
+import someFunc from "redeclare.aqua"
+
+export someFunc

semantics/src/main/scala/aqua/semantics/header/ModuleSem.scala

@@ -11,6 +11,7 @@ import cats.kernel.Semigroup
 import cats.syntax.foldable.*
 import cats.syntax.functor.*
 import cats.syntax.option.*
+import cats.syntax.semigroup.*
 import cats.syntax.validated.*
 import cats.{Comonad, Monoid}
 
@@ -30,31 +31,32 @@ class ModuleSem[S[_]: Comonad, C: Picker](expr: ModuleExpr[S])(using
         name.value,
         shouldDeclare
       ),
-      (ctx, _) =>
+      (ctx, initCtx) =>
+        val sumCtx = ctx |+| initCtx
         // When file is handled, check that all the declarations exists
         if (declareAll.nonEmpty)
-          ctx.setModule(name.value, declares = ctx.all).validNec
-        else
+          val allDeclared = ctx.all ++ initCtx.all
+          sumCtx.setModule(name.value, declares = allDeclared).validNec
+        else {
+          // summarize contexts to allow redeclaration of imports
           (
             declareNames.fproductLeft(_.value) ::: declareCustom.fproductLeft(_.value)
           ).map { case (n, t) =>
-            ctx
-              .pick(n, None, ctx.module.nonEmpty)
+            sumCtx
+              .pick(n, None, sumCtx.module.nonEmpty)
               .toValidNec(
                 error(
                   t,
                   s"`$n` is expected to be declared, but declaration is not found in the file"
                 )
-              )
-              .void
+              ).void
           }.combineAll.as {
             val tokens = declareNames.map(n => n.value -> n) ++ declareCustom.map(a => a.value -> a)
-            val ctxWithDeclaresLoc = ctx.addOccurences(tokens)
+            val ctxWithDeclaresLoc = sumCtx.addOccurences(tokens)
             // TODO: why module name and declares is lost? where is it lost?
             ctxWithDeclaresLoc.setModule(name.value, declares = shouldDeclare)
           }
-            
-          
+        }
     )
 
     word.value.fold(

semantics/src/main/scala/aqua/semantics/rules/types/TypesInterpreter.scala

@@ -729,7 +729,7 @@ class TypesInterpreter[S[_], X](using
         report
           .error(
             token,
-            s"Name `${name}` was already defined here"
+            s"Name `$name` was already defined here"
           )
           .as(ifDefined)
       case None => ifNotDefined