Historical `where` clause within angle brackets causes

[DougGregor]

Issue Kind

Bad Diagnostic Produced

Source Code

func genFn<T : Prot where T.Blarg : Prot2>(_: T) -> Int {}

Description

We get these diagnostics:

1:21: Expected '>' to end generic parameter clause
1:21: Expected argument list in function declaration
1:42: Extraneous '>(_: T) -> Int {}' at top level

vs. the existing compiler's

error: 'where' clause next to generic parameters is obsolete, must be written following the declaration's type

[ahoppen]

rdar://99789790