Fix test/AutoDiff/downstream/differentiable_attr_type_checking.swift

Author: Eugene Burmako

test/AutoDiff/downstream/differentiable_attr_type_checking.swift

@@ -532,7 +532,7 @@ func emptyWhereClause<T>(x: T) -> T {
   return x
 }
 
-// expected-error @+1 {{trailing 'where' clause in '@differentiable' attribute of non-generic function 'nongenericWhereClause(x:)'}}
+// expected-error @+1 {{where' clause is valid only when original function is generic 'nongenericWhereClause(x:)}}
 @differentiable(where T : Differentiable)
 func nongenericWhereClause(x: Float) -> Float {
   return x
@@ -640,7 +640,7 @@ func invalidAnyObjectRequirement<T : Differentiable>(x: T) -> T {
   return x
 }
 
-// expected-error @+1 {{'@differentiable' attribute does not support layout requirements}}
+// expected-error @+1 {{'@differentiable' attribute does not yet support layout requirements}}
 @differentiable(where Scalar : _Trivial)
 func invalidRequirementLayout<Scalar>(x: Scalar) -> Scalar {
   return x
@@ -846,19 +846,19 @@ struct NonDiffableStruct {
 }
 
 // expected-warning @+1 {{'jvp:' and 'vjp:' arguments in '@differentiable' attribute are deprecated}}
-@differentiable(linear, wrt: x, vjp: const3) // expected-error {{cannot specify 'vjp:' or 'jvp:' for linear functions; use 'transpose:' instead}}
+@differentiable(linear, wrt: x, vjp: const3) // expected-error {{cannot specify 'vjp:' or 'jvp:' for linear functions; use '@transpose' attribute for transpose registration instead}}
 func slope1(_ x: Float) -> Float {
   return 3 * x
 }
 
 // expected-warning @+1 {{'jvp:' and 'vjp:' arguments in '@differentiable' attribute are deprecated}}
-@differentiable(linear, wrt: x, jvp: const3) // expected-error {{cannot specify 'vjp:' or 'jvp:' for linear functions; use 'transpose:' instead}}
+@differentiable(linear, wrt: x, jvp: const3) // expected-error {{cannot specify 'vjp:' or 'jvp:' for linear functions; use '@transpose' attribute for transpose registration instead}}
 func slope2(_ x: Float) -> Float {
   return 3 * x
 }
 
 // expected-warning @+1 2 {{'jvp:' and 'vjp:' arguments in '@differentiable' attribute are deprecated}}
-@differentiable(linear, jvp: const3, vjp: const3) // expected-error {{cannot specify 'vjp:' or 'jvp:' for linear functions; use 'transpose:' instead}}
+@differentiable(linear, jvp: const3, vjp: const3) // expected-error {{cannot specify 'vjp:' or 'jvp:' for linear functions; use '@transpose' attribute for transpose registration instead}}
 func slope3(_ x: Float) -> Float {
   return 3 * x
 }