spec: clean up intro and replace bolded text with prose

- Remove "Draft" disclaimer. We're not done but the spec
  is in usable shape with respect to generics features.

- Remove section on "Earlier version" and fold information
  into the "Intro" section.

- Remove caveat for shifts: the rules for arithmetic operators
  on type parameters apply for them as well.

- Simply state that we don't support arguments of type parameter
  type for the built-ins real, imag, and complex.

Fixes #51182.

Change-Id: I6df1427de685cfe7055b64e91753aa7ebff70565
Reviewed-on: https://go-review.googlesource.com/c/go/+/391695
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

1 files changed, 10 insertions, 19 deletions

diff --git a/doc/go_spec.html b/doc/go_spec.html
index d241dada72..9b37e0ded0 100644
--- a/doc/go_spec.html
+++ b/doc/go_spec.html
@@ -1,21 +1,16 @@
 <!--{
-	"Title": "The Go Programming Language Specification - Go 1.18 Draft",
-	"Subtitle": "Version of March 9, 2022",
+	"Title": "The Go Programming Language Specification",
+	"Subtitle": "Version of March 10, 2022",
 	"Path": "/ref/spec"
 }-->
 
-<h2>Earlier version</h2>
-
-<p>
-For the pre-Go1.18 specification without generics support see
-<a href="/doc/go1.17_spec.html">The Go Programming Language Specification</a>.
-</p>
-
 <h2 id="Introduction">Introduction</h2>
 
 <p>
-This is a reference manual for the Go programming language. For
-more information and other documents, see <a href="/">golang.org</a>.
+This is the reference manual for the Go programming language.
+The pre-Go1.18 version, without generics, can be found
+<a href="/doc/go1.17_spec.html">here</a>.
+For more information and other documents, see <a href="/">golang.org</a>.
 </p>
 
 <p>
@@ -4668,10 +4663,6 @@ and the other operand is not, the constant is implicitly <a href="#Conversions">
 to the type of the other operand.
 </p>
 
-<p><b>
-[The rules for shifts need adjustments for type parameters. Issue #51182.]
-</b></p>
-
 <p>
 The right operand in a shift expression must have <a href="#Numeric_types">integer type</a>
 or be an untyped constant <a href="#Representability">representable</a> by a
@@ -7257,10 +7248,6 @@ does not exist, <code>delete</code> is a no-op.
 
 <h3 id="Complex_numbers">Manipulating complex numbers</h3>
 
-<p><b>
-[We don't support generic arguments for these built-ins for Go 1.18.]
-</b></p>
-
 <p>
 Three functions assemble and disassemble complex numbers.
 The built-in function <code>complex</code> constructs a complex
@@ -7323,6 +7310,10 @@ const c = imag(b)                  // untyped constant -1.4
 _ = imag(3 &lt;&lt; s)                   // illegal: 3 assumes complex type, cannot shift
 </pre>
 
+<p>
+Arguments of type parameter type are not permitted.
+</p>
+
 <h3 id="Handling_panics">Handling panics</h3>
 
 <p> Two built-in functions, <code>panic</code> and <code>recover</code>,