2 files changed, 61 insertions, 0 deletions

diff --git a/crates/ra_hir/src/ty/tests.rs b/crates/ra_hir/src/ty/tests.rs
index 5d7bc25cc..09c8644f7 100644
--- a/crates/ra_hir/src/ty/tests.rs
+++ b/crates/ra_hir/src/ty/tests.rs
@@ -334,6 +334,29 @@ fn test(x: &str, y: isize) {
     );
 }
 
+#[test]
+fn infer_array() {
+    check_inference(
+        r#"
+fn test(x: &str, y: isize) {
+    let a = [x];
+    let b = [a, a];
+    let c = [b, b];
+
+    let d = [y];
+    let e = [d, d];
+    let f = [e, e];
+
+    // we have not infered these case yet.
+    let g = [1, 2];
+    let h = ["a", "b"];
+    let b = [a, ["b"]];
+}
+"#,
+        "array.txt",
+    );
+}
+
 fn infer(content: &str) -> String {
     let (db, _, file_id) = MockDatabase::with_single_file(content);
     let source_file = db.source_file(file_id);
diff --git a/crates/ra_hir/src/ty/tests/data/array.txt b/crates/ra_hir/src/ty/tests/data/array.txt
new file mode 100644
index 000000000..7711e378b
--- /dev/null
+++ b/crates/ra_hir/src/ty/tests/data/array.txt
@@ -0,0 +1,38 @@
+[9; 10) 'x': &str
+[18; 19) 'y': isize
+[28; 258) '{     ..."]]; }': ()
+[38; 39) 'a': [&str,]
+[42; 45) '[x]': [&str,]
+[43; 44) 'x': &str
+[55; 56) 'b': [[&str,], [&str,]]
+[59; 65) '[a, a]': [[&str,], [&str,]]
+[60; 61) 'a': [&str,]
+[63; 64) 'a': [&str,]
+[75; 76) 'c': [[[&str,], [&str,]], [[&str,], [&str,]]]
+[79; 85) '[b, b]': [[[&str,], [&str,]], [[&str,], [&str,]]]
+[80; 81) 'b': [[&str,], [&str,]]
+[83; 84) 'b': [[&str,], [&str,]]
+[96; 97) 'd': [isize,]
+[100; 103) '[y]': [isize,]
+[101; 102) 'y': isize
+[113; 114) 'e': [[isize,], [isize,]]
+[117; 123) '[d, d]': [[isize,], [isize,]]
+[118; 119) 'd': [isize,]
+[121; 122) 'd': [isize,]
+[133; 134) 'f': [[[isize,], [isize,]], [[isize,], [isize,]]]
+[137; 143) '[e, e]': [[[isize,], [isize,]], [[isize,], [isize,]]]
+[138; 139) 'e': [[isize,], [isize,]]
+[141; 142) 'e': [[isize,], [isize,]]
+[197; 198) 'g': [_, _]
+[201; 207) '[1, 2]': [_, _]
+[202; 203) '1': [unknown]
+[205; 206) '2': [unknown]
+[217; 218) 'h': [_, _]
+[221; 231) '["a", "b"]': [_, _]
+[222; 225) '"a"': [unknown]
+[227; 230) '"b"': [unknown]
+[241; 242) 'b': [[&str,], [_,]]
+[245; 255) '[a, ["b"]]': [[&str,], [_,]]
+[246; 247) 'a': [&str,]
+[249; 254) '["b"]': [_,]
+[250; 253) '"b"': [unknown]