1 files changed, 90 insertions, 0 deletions
diff --git a/src/test/debuginfo/struct-style-enum.rs b/src/test/debuginfo/struct-style-enum.rs
new file mode 100644
index 000000000..3d819e368
--- /dev/null
+++ b/src/test/debuginfo/struct-style-enum.rs
@@ -0,0 +1,90 @@
+// Require a gdb or lldb that can read DW_TAG_variant_part.
+// min-gdb-version: 8.2
+// rust-lldb
+
+// compile-flags:-g
+
+// === GDB TESTS ===================================================================================
+
+// gdb-command:set print union on
+// gdb-command:run
+
+// gdb-command:print case1
+// gdbr-check:$1 = struct_style_enum::Regular::Case1{a: 0, b: 31868, c: 31868, d: 31868, e: 31868}
+
+// gdb-command:print case2
+// gdbr-check:$2 = struct_style_enum::Regular::Case2{a: 0, b: 286331153, c: 286331153}
+
+// gdb-command:print case3
+// gdbr-check:$3 = struct_style_enum::Regular::Case3{a: 0, b: 6438275382588823897}
+
+// gdb-command:print univariant
+// gdbr-check:$4 = struct_style_enum::Univariant::TheOnlyCase{a: -1}
+
+
+// === LLDB TESTS ==================================================================================
+
+// lldb-command:run
+
+// lldb-command:print case1
+// lldbr-check:(struct_style_enum::Regular::Case1) case1 = { a = 0 b = 31868 c = 31868 d = 31868 e = 31868 }
+
+// lldb-command:print case2
+// lldbr-check:(struct_style_enum::Regular::Case2) case2 = Case2 { Case1: 0, Case2: 286331153, Case3: 286331153 }
+
+// lldb-command:print case3
+// lldbr-check:(struct_style_enum::Regular::Case3) case3 = Case3 { Case1: 0, Case2: 6438275382588823897 }
+
+// lldb-command:print univariant
+// lldbr-check:(struct_style_enum::Univariant) univariant = Univariant { TheOnlyCase: TheOnlyCase { a: -1 } }
+
+#![allow(unused_variables)]
+#![feature(omit_gdb_pretty_printer_section)]
+#![omit_gdb_pretty_printer_section]
+
+use self::Regular::{Case1, Case2, Case3};
+use self::Univariant::TheOnlyCase;
+
+// The first element is to ensure proper alignment, irrespective of the machines word size. Since
+// the size of the discriminant value is machine dependent, this has be taken into account when
+// datatype layout should be predictable as in this case.
+enum Regular {
+    Case1 { a: u64, b: u16, c: u16, d: u16, e: u16},
+    Case2 { a: u64, b: u32, c: u32},
+    Case3 { a: u64, b: u64 }
+}
+
+enum Univariant {
+    TheOnlyCase { a: i64 }
+}
+
+fn main() {
+
+    // In order to avoid endianness trouble all of the following test values consist of a single
+    // repeated byte. This way each interpretation of the union should look the same, no matter if
+    // this is a big or little endian machine.
+
+    // 0b0111110001111100011111000111110001111100011111000111110001111100 = 8970181431921507452
+    // 0b01111100011111000111110001111100 = 2088533116
+    // 0b0111110001111100 = 31868
+    // 0b01111100 = 124
+    let case1 = Case1 { a: 0, b: 31868, c: 31868, d: 31868, e: 31868 };
+
+    // 0b0001000100010001000100010001000100010001000100010001000100010001 = 1229782938247303441
+    // 0b00010001000100010001000100010001 = 286331153
+    // 0b0001000100010001 = 4369
+    // 0b00010001 = 17
+    let case2 = Case2 { a: 0, b: 286331153, c: 286331153 };
+
+    // 0b0101100101011001010110010101100101011001010110010101100101011001 = 6438275382588823897
+    // 0b01011001010110010101100101011001 = 1499027801
+    // 0b0101100101011001 = 22873
+    // 0b01011001 = 89
+    let case3 = Case3 { a: 0, b: 6438275382588823897 };
+
+    let univariant = TheOnlyCase { a: -1 };
+
+    zzz(); // #break
+}
+
+fn zzz() {()}