Merge pull request #7128 from roc-lang/fix-7103

Ignore final try suffix for annotated top-level defs

crates/compiler/can/src/desugar.rs

@@ -248,8 +248,7 @@ pub fn desugar_value_def_suffixed<'a>(arena: &'a Bump, value_def: ValueDef<'a>)
             body_pattern,
             body_expr,
         } => {
-            // note called_from_def is passed as `false` as this is a top_level_def
-            match unwrap_suffixed_expression(arena, body_expr, None) {
+            match unwrap_suffixed_expression(arena, body_expr, Some(ann_pattern)) {
                 Ok(new_expr) => AnnotatedBody {
                     ann_pattern,
                     ann_type,
@@ -280,6 +279,19 @@ pub fn desugar_value_def_suffixed<'a>(arena: &'a Bump, value_def: ValueDef<'a>)
                         ),
                     },
                 ),
+                // When the last expression is suffixed, it will try to unwrap the def, but because we
+                // have an annotated def we can simply ignore the try and return it as is without
+                // creating an intermediate identifier
+                Err(EUnwrapped::UnwrappedDefExpr { loc_expr, .. }) => desugar_value_def_suffixed(
+                    arena,
+                    AnnotatedBody {
+                        ann_pattern,
+                        ann_type,
+                        lines_between,
+                        body_pattern,
+                        body_expr: loc_expr,
+                    },
+                ),
                 Err(..) => AnnotatedBody {
                     ann_pattern,
                     ann_type,

crates/compiler/can/src/suffixed.rs

@@ -325,8 +325,15 @@ pub fn unwrap_suffixed_expression_apply_help<'a>(
 
                 let new_apply = arena.alloc(Loc::at(loc_expr.region, Expr::Apply(unwrapped_function, local_args, called_via)));
 
+                match maybe_def_pat {
+                    Some(..) => {
+                        return Err(EUnwrapped::UnwrappedDefExpr { loc_expr: new_apply, target });
+                    }
+                    None => {
                         return init_unwrapped_err(arena, new_apply, maybe_def_pat, target);
                     }
+                }
+            }
 
             // function is another expression
             match unwrap_suffixed_expression(arena, function, maybe_def_pat) {

crates/compiler/can/tests/snapshots/test_suffixed__suffixed_tests__issue_7103.snap

@@ -0,0 +1,75 @@
+---
+source: crates/compiler/can/tests/test_suffixed.rs
+expression: snapshot
+---
+Defs {
+    tags: [
+        Index(2147483648),
+        Index(2147483649),
+    ],
+    regions: [
+        @0-33,
+        @35-45,
+    ],
+    space_before: [
+        Slice(start = 0, length = 0),
+        Slice(start = 0, length = 2),
+    ],
+    space_after: [
+        Slice(start = 0, length = 0),
+        Slice(start = 2, length = 1),
+    ],
+    spaces: [
+        Newline,
+        Newline,
+        Newline,
+    ],
+    type_defs: [],
+    value_defs: [
+        AnnotatedBody {
+            ann_pattern: @0-3 Identifier {
+                ident: "run",
+            },
+            ann_type: @6-15 Apply(
+                "",
+                "Task",
+                [
+                    @11-13 Record {
+                        fields: [],
+                        ext: None,
+                    },
+                    @14-15 Inferred,
+                ],
+            ),
+            lines_between: [
+                Newline,
+            ],
+            body_pattern: @16-19 Identifier {
+                ident: "run",
+            },
+            body_expr: @22-33 Apply(
+                @22-33 Var {
+                    module_name: "",
+                    ident: "line",
+                },
+                [
+                    @28-33 Str(
+                        PlainLine(
+                            "foo",
+                        ),
+                    ),
+                ],
+                Space,
+            ),
+        },
+        Body(
+            @35-39 Identifier {
+                ident: "main",
+            },
+            @42-45 Var {
+                module_name: "",
+                ident: "run",
+            },
+        ),
+    ],
+}

crates/compiler/can/tests/test_suffixed.rs

@@ -632,6 +632,18 @@ mod suffixed_tests {
             "##
         );
     }
+
+    #[test]
+    fn issue_7103() {
+        run_test!(
+            r##"
+            run : Task {} _
+            run = line! "foo"
+
+            main = run
+            "##
+        );
+    }
 }
 
 #[cfg(test)]