lsp: quick fixes for hints and bare library names; comment cleanup

an undefined bare name that a module exports now says which one:
"put_c is used but never defined; did you mean to include rt and use
rt.put_c?", and the import quick fix is titled the same way and marked
preferred when it is the only one, so the editor's auto-fix applies it.

hints gain quick fixes that keep the program's meaning: an unused
parameter, or a local with no other use, is renamed to _; a constant
local with one declarator becomes const; a power-of-two multiply becomes
a parenthesized shift (not when a * / or % binds its left operand); and
let p = rt.new(n) with a small constant becomes let p[n]. the hints no
longer fire for _ discards or for locals already declared const.

whole-line /* */ comments in zc sources are // comments now, and //: is
gone from the maintained sources: the notes it marked were mostly the
documentation of the declaration below, which hovers now show. section
headers are separated from the declarations after them.

1 files changed, 3 insertions, 0 deletions

diff --git a/tests/test.sh b/tests/test.sh
index 811a09a..449da87 100755
--- a/tests/test.sh
+++ b/tests/test.sh
@@ -550,6 +550,9 @@ s_lsp() {
 				grep -v '^ok' $T/contracts-$group.out
 				chk $r 0 "lsp: $group contracts"
 			done
+			node tests/drivers/hint_fixes_test.js $lsp > $T/hintfixes.out 2>&1; r=$?
+			grep -v '^ok' $T/hintfixes.out
+			chk $r 0 "lsp: hint and import quick fixes keep the program's meaning"
 			node tests/drivers/codeactions_client_test.js > $T/codeactions-client.out 2>&1; r=$?
 			grep -v '^ok' $T/codeactions-client.out
 			chk $r 0 "lsp: versioned import quick-fix edits"