go/parser,go/types: hide API changes related to type parameters
While the dev.typeparams branch was merged, the type parameter API is
slated for go1.18. Hide these changes to the go/parser and go/types API.
This was done as follows:
+ For APIs that will probably not be needed for go1.18, simply unexport
them.
+ For APIs that we expect to export in go1.18, prefix symbols with '_',
so that the planned (upper-cased) symbol name is apparent.
+ For APIs that must be exported for testing, move both API and tests
to files guarded by the go1.18 build constraint.
+ parser.ParseTypeParams is unexported and copied wherever it is
needed.
+ The -G flag is removed from gofmt, replaced by enabling type
parameters if built with the go1.18 build constraint.
Notably, changes related to type parameters in go/ast are currently left
exported. We're looking at the AST API separately.
The new API diff from 1.16 is:
+pkg go/ast, method (*FuncDecl) IsMethod() bool
+pkg go/ast, method (*ListExpr) End() token.Pos
+pkg go/ast, method (*ListExpr) Pos() token.Pos
+pkg go/ast, type FuncType struct, TParams *FieldList
+pkg go/ast, type ListExpr struct
+pkg go/ast, type ListExpr struct, ElemList []Expr
+pkg go/ast, type TypeSpec struct, TParams *FieldList
+pkg go/types, type Config struct, GoVersion string\f
Change-Id: I1baf67e26279b49092e774309a836c460979774a
Reviewed-on: https://go-review.googlesource.com/c/go/+/295929
Trust: Robert Findley <rfindley@google.com>
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Robert Griesemer <gri@golang.org>