b7a695bd68
When parsing a declaration of the form
type a [b[c]]d
where a, b, c, d stand for identifiers, b[c] is parsed as a type
constraint (because an array length must be constant and an index
expression b[c] is never constant, even if b is a constant string
and c a constant index - this is crucial for disambiguation of the
various possibilities).
As a result, the error message referred to a missing type parameter
name and not an invalid array declaration.
Recognize this special case and report both possibilities (because
we can't be sure without type information) with the new error:
"missing type parameter name or invalid array length"
ALso, change the previous error message
"type parameter must be named"
to
"missing type parameter name"
which is more fitting as the error refers to an absent type parameter
(rather than a type parameter that's somehow invisibly present but
unnamed).
Fixes #60812.
Change-Id: Iaad3b3a9aeff9dfe2184779f3d799f16c7500b34
Reviewed-on: https://go-review.googlesource.com/c/go/+/538856
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
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