GDB responds with some overly detailed lines - which makes the tests fail.
Patch rust to accept those instead.
diff -ur orig/rustc-1.25.0-src/src/test/debuginfo/generic-enum-with-different-disr-sizes.rs rustc-1.25.0-src/src/test/debuginfo/generic-enum-with-different-disr-sizes.rs
--- orig/rustc-1.25.0-src/src/test/debuginfo/generic-enum-with-different-disr-sizes.rs	2018-09-13 10:24:33.775565159 +0200
+++ rustc-1.25.0-src/src/test/debuginfo/generic-enum-with-different-disr-sizes.rs	2018-09-13 10:25:56.322513658 +0200
@@ -19,36 +19,36 @@
 
 // gdb-command:print eight_bytes1
 // gdbg-check:$1 = {{RUST$ENUM$DISR = Variant1, __0 = 100}, {RUST$ENUM$DISR = Variant1, __0 = 100}}
-// gdbr-check:$1 = generic_enum_with_different_disr_sizes::Enum::Variant1(100)
+// gdbr-check:$1 = generic_enum_with_different_disr_sizes::Enum<f64>::Variant1(100)
 
 // gdb-command:print four_bytes1
 // gdbg-check:$2 = {{RUST$ENUM$DISR = Variant1, __0 = 101}, {RUST$ENUM$DISR = Variant1, __0 = 101}}
-// gdbr-check:$2 = generic_enum_with_different_disr_sizes::Enum::Variant1(101)
+// gdbr-check:$2 = generic_enum_with_different_disr_sizes::Enum<i32>::Variant1(101)
 
 // gdb-command:print two_bytes1
 // gdbg-check:$3 = {{RUST$ENUM$DISR = Variant1, __0 = 102}, {RUST$ENUM$DISR = Variant1, __0 = 102}}
-// gdbr-check:$3 = generic_enum_with_different_disr_sizes::Enum::Variant1(102)
+// gdbr-check:$3 = generic_enum_with_different_disr_sizes::Enum<i16>::Variant1(102)
 
 // gdb-command:print one_byte1
 // gdbg-check:$4 = {{RUST$ENUM$DISR = Variant1, __0 = 65 'A'}, {RUST$ENUM$DISR = Variant1, __0 = 65 'A'}}
-// gdbr-check:$4 = generic_enum_with_different_disr_sizes::Enum::Variant1(65)
+// gdbr-check:$4 = generic_enum_with_different_disr_sizes::Enum<u8>::Variant1(65)
 
 
 // gdb-command:print eight_bytes2
 // gdbg-check:$5 = {{RUST$ENUM$DISR = Variant2, __0 = 100}, {RUST$ENUM$DISR = Variant2, __0 = 100}}
-// gdbr-check:$5 = generic_enum_with_different_disr_sizes::Enum::Variant2(100)
+// gdbr-check:$5 = generic_enum_with_different_disr_sizes::Enum<f64>::Variant2(100)
 
 // gdb-command:print four_bytes2
 // gdbg-check:$6 = {{RUST$ENUM$DISR = Variant2, __0 = 101}, {RUST$ENUM$DISR = Variant2, __0 = 101}}
-// gdbr-check:$6 = generic_enum_with_different_disr_sizes::Enum::Variant2(101)
+// gdbr-check:$6 = generic_enum_with_different_disr_sizes::Enum<i32>::Variant2(101)
 
 // gdb-command:print two_bytes2
 // gdbg-check:$7 = {{RUST$ENUM$DISR = Variant2, __0 = 102}, {RUST$ENUM$DISR = Variant2, __0 = 102}}
-// gdbr-check:$7 = generic_enum_with_different_disr_sizes::Enum::Variant2(102)
+// gdbr-check:$7 = generic_enum_with_different_disr_sizes::Enum<i16>::Variant2(102)
 
 // gdb-command:print one_byte2
 // gdbg-check:$8 = {{RUST$ENUM$DISR = Variant2, __0 = 65 'A'}, {RUST$ENUM$DISR = Variant2, __0 = 65 'A'}}
-// gdbr-check:$8 = generic_enum_with_different_disr_sizes::Enum::Variant2(65)
+// gdbr-check:$8 = generic_enum_with_different_disr_sizes::Enum<u8>::Variant2(65)
 
 // gdb-command:continue
 
diff -ur orig/rustc-1.25.0-src/src/test/debuginfo/generic-struct-style-enum.rs rustc-1.25.0-src/src/test/debuginfo/generic-struct-style-enum.rs
--- orig/rustc-1.25.0-src/src/test/debuginfo/generic-struct-style-enum.rs	2018-09-13 10:24:33.775565159 +0200
+++ rustc-1.25.0-src/src/test/debuginfo/generic-struct-style-enum.rs	2018-09-13 10:27:43.353108111 +0200
@@ -19,15 +19,15 @@
 
 // gdb-command:print case1
 // gdbg-check:$1 = {{RUST$ENUM$DISR = Case1, a = 0, b = 31868, c = 31868, d = 31868, e = 31868}, {RUST$ENUM$DISR = Case1, [...]}, {RUST$ENUM$DISR = Case1, [...]}}
-// gdbr-check:$1 = generic_struct_style_enum::Regular::Case1{a: 0, b: 31868, c: 31868, d: 31868, e: 31868}
+// gdbr-check:$1 = generic_struct_style_enum::Regular<u16, u32, i64>::Case1{a: 0, b: 31868, c: 31868, d: 31868, e: 31868}
 
 // gdb-command:print case2
 // gdbg-check:$2 = {{RUST$ENUM$DISR = Case2, [...]}, {RUST$ENUM$DISR = Case2, a = 0, b = 286331153, c = 286331153}, {RUST$ENUM$DISR = Case2, [...]}}
-// gdbr-check:$2 = generic_struct_style_enum::Regular::Case2{a: 0, b: 286331153, c: 286331153}
+// gdbr-check:$2 = generic_struct_style_enum::Regular<i16, u32, i64>::Case2{a: 0, b: 286331153, c: 286331153}
 
 // gdb-command:print case3
 // gdbg-check:$3 = {{RUST$ENUM$DISR = Case3, [...]}, {RUST$ENUM$DISR = Case3, [...]}, {RUST$ENUM$DISR = Case3, a = 0, b = 6438275382588823897}}
-// gdbr-check:$3 = generic_struct_style_enum::Regular::Case3{a: 0, b: 6438275382588823897}
+// gdbr-check:$3 = generic_struct_style_enum::Regular<u16, i32, u64>::Case3{a: 0, b: 6438275382588823897}
 
 // gdb-command:print univariant
 // gdbg-check:$4 = {{a = -1}}
diff -ur orig/rustc-1.25.0-src/src/test/debuginfo/generic-tuple-style-enum.rs rustc-1.25.0-src/src/test/debuginfo/generic-tuple-style-enum.rs
--- orig/rustc-1.25.0-src/src/test/debuginfo/generic-tuple-style-enum.rs	2018-09-13 10:24:33.775565159 +0200
+++ rustc-1.25.0-src/src/test/debuginfo/generic-tuple-style-enum.rs	2018-09-13 10:28:26.328546298 +0200
@@ -21,15 +21,15 @@
 
 // gdb-command:print case1
 // gdbg-check:$1 = {{RUST$ENUM$DISR = Case1, __0 = 0, __1 = 31868, __2 = 31868, __3 = 31868, __4 = 31868}, {RUST$ENUM$DISR = Case1, [...]}, {RUST$ENUM$DISR = Case1, [...]}}
-// gdbr-check:$1 = generic_tuple_style_enum::Regular::Case1(0, 31868, 31868, 31868, 31868)
+// gdbr-check:$1 = generic_tuple_style_enum::Regular<u16, u32, u64>::Case1(0, 31868, 31868, 31868, 31868)
 
 // gdb-command:print case2
 // gdbg-check:$2 = {{RUST$ENUM$DISR = Case2, [...]}, {RUST$ENUM$DISR = Case2, __0 = 0, __1 = 286331153, __2 = 286331153}, {RUST$ENUM$DISR = Case2, [...]}}
-// gdbr-check:$2 = generic_tuple_style_enum::Regular::Case2(0, 286331153, 286331153)
+// gdbr-check:$2 = generic_tuple_style_enum::Regular<i16, i32, i64>::Case2(0, 286331153, 286331153)
 
 // gdb-command:print case3
 // gdbg-check:$3 = {{RUST$ENUM$DISR = Case3, [...]}, {RUST$ENUM$DISR = Case3, [...]}, {RUST$ENUM$DISR = Case3, __0 = 0, __1 = 6438275382588823897}}
-// gdbr-check:$3 = generic_tuple_style_enum::Regular::Case3(0, 6438275382588823897)
+// gdbr-check:$3 = generic_tuple_style_enum::Regular<i16, i32, i64>::Case3(0, 6438275382588823897)
 
 // gdb-command:print univariant
 // gdbg-check:$4 = {{__0 = -1}}
--- orig/rustc-1.25.0-src/src/test/debuginfo/nil-enum.rs	2018-09-13 10:24:33.783565071 +0200
+++ rustc-1.25.0-src/src/test/debuginfo/nil-enum.rs	2018-10-26 18:19:20.404564587 +0200
@@ -17,11 +17,11 @@
 
 // gdb-command:print first
 // gdbg-check:$1 = {<No data fields>}
-// gdbr-check:$1 = <error reading variable>
+// gdbr-check:$1 = nil_enum::ANilEnum
 
 // gdb-command:print second
 // gdbg-check:$2 = {<No data fields>}
-// gdbr-check:$2 = <error reading variable>
+// gdbr-check:$2 = nil_enum::AnotherNilEnum
 
 #![allow(unused_variables)]
 #![feature(omit_gdb_pretty_printer_section)]