diff --git a/src/host/genminilua.lua b/src/host/genminilua.lua
index e9a68297..16a81a23 100644
--- a/src/host/genminilua.lua
+++ b/src/host/genminilua.lua
@@ -157,11 +157,11 @@ local function merge_includes(src)
     if includes[name] then return "" end
     includes[name] = true
     local fp = assert(io.open(LUA_SOURCE..name, "r"))
-    local src = fp:read("*a")
+    local inc = fp:read("*a")
     assert(fp:close())
-    src = gsub(src, "#ifndef%s+%w+_h\n#define%s+%w+_h\n", "")
-    src = gsub(src, "#endif%s*$", "")
-    return merge_includes(src)
+    inc = gsub(inc, "#ifndef%s+%w+_h\n#define%s+%w+_h\n", "")
+    inc = gsub(inc, "#endif%s*$", "")
+    return merge_includes(inc)
   end)
 end
 
diff --git a/src/jit/dis_arm.lua b/src/jit/dis_arm.lua
index 1296d816..5d2cdbda 100644
--- a/src/jit/dis_arm.lua
+++ b/src/jit/dis_arm.lua
@@ -12,7 +12,7 @@
 
 local type = type
 local sub, byte, format = string.sub, string.byte, string.format
-local match, gmatch, gsub = string.match, string.gmatch, string.gsub
+local match, gmatch = string.match, string.gmatch
 local concat = table.concat
 local bit = require("bit")
 local band, bor, ror, tohex = bit.band, bit.bor, bit.ror, bit.tohex
diff --git a/src/jit/dis_mips.lua b/src/jit/dis_mips.lua
index 6776f0cb..c8fb0ea8 100644
--- a/src/jit/dis_mips.lua
+++ b/src/jit/dis_mips.lua
@@ -11,8 +11,8 @@
 ------------------------------------------------------------------------------
 
 local type = type
-local sub, byte, format = string.sub, string.byte, string.format
-local match, gmatch, gsub = string.match, string.gmatch, string.gsub
+local byte, format = string.byte, string.format
+local match, gmatch = string.match, string.gmatch
 local concat = table.concat
 local bit = require("bit")
 local band, bor, tohex = bit.band, bit.bor, bit.tohex
diff --git a/src/jit/dis_ppc.lua b/src/jit/dis_ppc.lua
index 30f51ecd..30eb3978 100644
--- a/src/jit/dis_ppc.lua
+++ b/src/jit/dis_ppc.lua
@@ -13,7 +13,7 @@
 ------------------------------------------------------------------------------
 
 local type = type
-local sub, byte, format = string.sub, string.byte, string.format
+local byte, format = string.byte, string.format
 local match, gmatch, gsub = string.match, string.gmatch, string.gsub
 local concat = table.concat
 local bit = require("bit")
diff --git a/src/jit/dis_x86.lua b/src/jit/dis_x86.lua
index 0bbd198f..8cac9ae9 100644
--- a/src/jit/dis_x86.lua
+++ b/src/jit/dis_x86.lua
@@ -818,7 +818,7 @@ map_act = {
       m = b%32; b = (b-m)/32
       local nb = b%2; b = (b-nb)/2
       if nb == 0 then ctx.rexb = true end
-      local nx = b%2; b = (b-nx)/2
+      local nx = b%2
       if nx == 0 then ctx.rexx = true end
       b = byte(ctx.code, pos, pos)
       if not b then return incomplete(ctx) end
diff --git a/src/jit/dump.lua b/src/jit/dump.lua
index a635af10..1eca12a8 100644
--- a/src/jit/dump.lua
+++ b/src/jit/dump.lua
@@ -63,9 +63,9 @@ local traceinfo, traceir, tracek = jutil.traceinfo, jutil.traceir, jutil.tracek
 local tracemc, tracesnap = jutil.tracemc, jutil.tracesnap
 local traceexitstub, ircalladdr = jutil.traceexitstub, jutil.ircalladdr
 local bit = require("bit")
-local band, shl, shr, tohex = bit.band, bit.lshift, bit.rshift, bit.tohex
+local band, shr, tohex = bit.band, bit.rshift, bit.tohex
 local sub, gsub, format = string.sub, string.gsub, string.format
-local byte, char, rep = string.byte, string.char, string.rep
+local byte, rep = string.byte, string.rep
 local type, tostring = type, tostring
 local stdout, stderr = io.stdout, io.stderr
 
@@ -213,7 +213,7 @@ local colortype_ansi = {
   "\027[35m%s\027[m",
 }
 
-local function colorize_text(s, t)
+local function colorize_text(s)
   return s
 end
 
diff --git a/src/jit/p.lua b/src/jit/p.lua
index 5323728b..09b3b9fe 100644
--- a/src/jit/p.lua
+++ b/src/jit/p.lua
@@ -120,7 +120,7 @@ end
 -- Show top N list.
 local function prof_top(count1, count2, samples, indent)
   local t, n = {}, 0
-  for k, v in pairs(count1) do
+  for k in pairs(count1) do
     n = n + 1
     t[n] = k
   end