add tests for parser

src/test/ui/generic-associated-types/parse/issue-67510-1.rs

@@ -0,0 +1,16 @@
+// Several parsing errors for associated type constraints that are supposed
+// to trigger all errors in ´get_assoc_type_with_generics´ and
+// ´get_generic_args_from_path_segment´ 
+
+#![feature(generic_associated_types)]
+
+trait X {
+    type Y<'a>;
+}
+
+trait Z {}
+
+impl<T : X<X::Y<'a> = &'a u32>> Z for T {} 
+    //~^ ERROR: associated types cannot contain multiple path segments 
+
+fn main() {}

src/test/ui/generic-associated-types/parse/issue-67510-1.stderr

@@ -0,0 +1,10 @@
+error: found a Path with multiple segments, expected a Path with a single segment
+  --> /Users/bn/Documents/rust_fork/rust/src/test/ui/generic-associated-types/parse/issue-67510-1.rs:13:12
+   |
+13 | impl<T : X<X::Y<'a> = &'a u32>> Z for T {} 
+   |            ^^^^^^^^
+   |            |
+   |            expected the name of an associated type
+   |            help: try to use only the last segment:: `Y`
+
+error: aborting due to previous error

src/test/ui/generic-associated-types/parse/issue-67510-2.rs

@@ -0,0 +1,12 @@
+// Only accept generic arguments of typeTyKind::Path as associated types in
+// trait paths
+#![feature(generic_associated_types)]
+
+trait X { 
+    type Y<'a>;
+}
+
+fn f1<'a>(arg : Box<dyn X<(Y<'a>) = &'a ()>>) {} 
+    //~^ ERROR: Expected the name of an associated type
+
+fn main() {}

src/test/ui/generic-associated-types/parse/issue-67510-2.stderr

@@ -0,0 +1,18 @@
+error: Incorrect type of generic argument, expected a Path with a single path segment
+ --> /Users/bn/Documents/rust_fork/rust/src/test/ui/generic-associated-types/parse/issue-67510-2.rs:9:27
+  |
+9 | fn f1<'a>(arg : Box<dyn X<(Y<'a>) = &'a ()>>) {} 
+  |                           ^^^^^^^^-
+  |                                   |
+  |                                   Expected the name of an associated type
+
+warning: the feature `generic_associated_types` is incomplete and may not be safe to use and/or cause compiler crashes
+ --> /Users/bn/Documents/rust_fork/rust/src/test/ui/generic-associated-types/parse/issue-67510-2.rs:3:12
+  |
+3 | #![feature(generic_associated_types)]
+  |            ^^^^^^^^^^^^^^^^^^^^^^^^
+  |
+  = note: `#[warn(incomplete_features)]` on by default
+  = note: see issue #44265 <https://github.com/rust-lang/rust/issues/44265> for more information
+
+error: aborting due to previous error; 1 warning emitted

src/test/ui/generic-associated-types/parse/issue-67510-3.rs

@@ -0,0 +1,12 @@
+// Test to ensure that only GenericArg::Type is accepted in associated type
+// constraints
+#![feature(generic_associated_types)]
+
+trait X { 
+    type Y<'a>;
+}
+
+fn f1<'a>(arg : Box<dyn X<'a = &'a ()>>) {}  
+    //~^ ERROR: Expected the name of an associated type
+
+fn main() {}

src/test/ui/generic-associated-types/parse/issue-67510-3.stderr

@@ -0,0 +1,16 @@
+error: Incorrect type of generic argument, expected a path with a single segment
+ --> /Users/bn/Documents/rust_fork/rust/src/test/ui/generic-associated-types/parse/issue-67510-3.rs:9:27
+  |
+9 | fn f1<'a>(arg : Box<dyn X<'a = &'a ()>>) {}  
+  |                           ^^^^ expected the name of an associated type
+
+warning: the feature `generic_associated_types` is incomplete and may not be safe to use and/or cause compiler crashes
+ --> /Users/bn/Documents/rust_fork/rust/src/test/ui/generic-associated-types/parse/issue-67510-3.rs:3:12
+  |
+3 | #![feature(generic_associated_types)]
+  |            ^^^^^^^^^^^^^^^^^^^^^^^^
+  |
+  = note: `#[warn(incomplete_features)]` on by default
+  = note: see issue #44265 <https://github.com/rust-lang/rust/issues/44265> for more information
+
+error: aborting due to previous error; 1 warning emitted

src/test/ui/generic-associated-types/parse/issue-67510-4.rs

@@ -0,0 +1,14 @@
+// Only accept lifetimes or types as generic arguments for associated types 
+// in trait paths
+
+#![feature(generic_associated_types)]
+
+trait X { 
+    type Y<'a>;
+}
+
+fn f1<'a>(arg : Box<dyn X<Y<1> = &'a ()>>) {}  
+    //~^  ERROR: generic arguments of associated types must be lifetimes or types
+    //~^^ ERROR: wrong number of lifetime arguments: expected 1, found 0 
+
+fn main() {}

src/test/ui/generic-associated-types/parse/issue-67510-4.stderr

@@ -0,0 +1,24 @@
+error: generic arguments of associated types must be lifetimes or types
+  --> /Users/bn/Documents/rust_fork/rust/src/test/ui/generic-associated-types/parse/issue-67510-4.rs:10:27
+   |
+10 | fn f1<'a>(arg : Box<dyn X<Y<1> = &'a ()>>) {}  
+   |                           ^
+
+warning: the feature `generic_associated_types` is incomplete and may not be safe to use and/or cause compiler crashes
+ --> /Users/bn/Documents/rust_fork/rust/src/test/ui/generic-associated-types/parse/issue-67510-4.rs:4:12
+  |
+4 | #![feature(generic_associated_types)]
+  |            ^^^^^^^^^^^^^^^^^^^^^^^^
+  |
+  = note: `#[warn(incomplete_features)]` on by default
+  = note: see issue #44265 <https://github.com/rust-lang/rust/issues/44265> for more information
+
+error[E0107]: wrong number of lifetime arguments: expected 1, found 0
+  --> /Users/bn/Documents/rust_fork/rust/src/test/ui/generic-associated-types/parse/issue-67510-4.rs:10:27
+   |
+10 | fn f1<'a>(arg : Box<dyn X<Y<1> = &'a ()>>) {}  
+   |                           ^^^^^^^^^^^^^ expected 1 lifetime argument
+
+error: aborting due to 2 previous errors; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0107`.

src/test/ui/generic-associated-types/parse/issue-67510-5.rs

@@ -0,0 +1,12 @@
+// Test to ensure that the Constraint branch of the pattern match on AngleBracketedArg
+// in `get_assoc_type_with_generic_args` is unreachable
+#![feature(generic_associated_types)]
+
+trait X { 
+    type Y<'a>;
+}
+
+fn f1<'a>(arg : Box<dyn X<Y = B = &'a ()>>) {}  
+    //~^ ERROR: Expected the name of an associated type
+
+fn main() {}

src/test/ui/generic-associated-types/parse/issue-67510-5.stderr

@@ -0,0 +1,16 @@
+error: expected one of `!`, `(`, `+`, `,`, `::`, `<`, or `>`, found `=`
+ --> /Users/bn/Documents/rust_fork/rust/src/test/ui/generic-associated-types/parse/issue-67510-5.rs:9:33
+  |
+9 | fn f1<'a>(arg : Box<dyn X<Y = B = &'a ()>>) {}  
+  |                                 ^ expected one of 7 possible tokens
+
+warning: the feature `generic_associated_types` is incomplete and may not be safe to use and/or cause compiler crashes
+ --> /Users/bn/Documents/rust_fork/rust/src/test/ui/generic-associated-types/parse/issue-67510-5.rs:3:12
+  |
+3 | #![feature(generic_associated_types)]
+  |            ^^^^^^^^^^^^^^^^^^^^^^^^
+  |
+  = note: `#[warn(incomplete_features)]` on by default
+  = note: see issue #44265 <https://github.com/rust-lang/rust/issues/44265> for more information
+
+error: aborting due to previous error; 1 warning emitted

src/test/ui/generic-associated-types/parse/issue-67510-6.rs

@@ -0,0 +1,16 @@
+// Parser shouldn't accept parenthesized generic arguments for associated types in
+// trait paths
+#![feature(generic_associated_types)]
+
+trait X { 
+    type Y<'a>;
+}
+
+fn f1<'a>(arg : Box<dyn X<Y('a) = &'a ()>>) {}  
+    //~^  ERROR: lifetime in trait object type must be followed by `+`
+    //~^^ ERROR: invalid use of parenthesized generic arguments, expected angle 
+    //           bracketed (`<...>`) generic arguments
+    //~^^^^ ERROR: wrong number of lifetime arguments: expected 1, found 0
+
+
+fn main() {}

src/test/ui/generic-associated-types/parse/issue-67510-6.stderr

@@ -0,0 +1,30 @@
+error: lifetime in trait object type must be followed by `+`
+ --> /Users/bn/Documents/rust_fork/rust/src/test/ui/generic-associated-types/parse/issue-67510-6.rs:9:29
+  |
+9 | fn f1<'a>(arg : Box<dyn X<Y('a) = &'a ()>>) {}  
+  |                             ^^
+
+error: invalid use of parenthesized generic arguments, expected angle bracketed (`<...>`) generic arguments
+ --> /Users/bn/Documents/rust_fork/rust/src/test/ui/generic-associated-types/parse/issue-67510-6.rs:9:27
+  |
+9 | fn f1<'a>(arg : Box<dyn X<Y('a) = &'a ()>>) {}  
+  |                           ^^^^^
+
+warning: the feature `generic_associated_types` is incomplete and may not be safe to use and/or cause compiler crashes
+ --> /Users/bn/Documents/rust_fork/rust/src/test/ui/generic-associated-types/parse/issue-67510-6.rs:3:12
+  |
+3 | #![feature(generic_associated_types)]
+  |            ^^^^^^^^^^^^^^^^^^^^^^^^
+  |
+  = note: `#[warn(incomplete_features)]` on by default
+  = note: see issue #44265 <https://github.com/rust-lang/rust/issues/44265> for more information
+
+error[E0107]: wrong number of lifetime arguments: expected 1, found 0
+ --> /Users/bn/Documents/rust_fork/rust/src/test/ui/generic-associated-types/parse/issue-67510-6.rs:9:27
+  |
+9 | fn f1<'a>(arg : Box<dyn X<Y('a) = &'a ()>>) {}  
+  |                           ^^^^^^^^^^^^^^ expected 1 lifetime argument
+
+error: aborting due to 3 previous errors; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0107`.