diff --git a/base/compiler/ssair/show.jl b/base/compiler/ssair/show.jl
index 7977826426b12..9598d3e8cfa26 100644
--- a/base/compiler/ssair/show.jl
+++ b/base/compiler/ssair/show.jl
@@ -629,8 +629,10 @@ function show_ir_stmt(io::IO, code::Union{IRCode, CodeInfo}, idx::Int, line_info
 
         @assert new_node_inst !== UNDEF # we filtered these out earlier
         show_type = should_print_ssa_type(new_node_inst)
-        with_output_color(:green, io) do io′
-            print_stmt(io′, node_idx, new_node_inst, used, maxlength_idx, false, show_type)
+        let maxlength_idx=maxlength_idx, show_type=show_type
+            with_output_color(:green, io) do io′
+                print_stmt(io′, node_idx, new_node_inst, used, maxlength_idx, false, show_type)
+            end
         end
 
         if new_node_type === UNDEF # try to be robust against errors
diff --git a/base/errorshow.jl b/base/errorshow.jl
index 121fb50db91c1..8b8ec532355a8 100644
--- a/base/errorshow.jl
+++ b/base/errorshow.jl
@@ -345,13 +345,15 @@ function showerror_ambiguous(io::IO, meth, f, args)
         sigfix = typeintersect(m.sig, sigfix)
     end
     if isa(unwrap_unionall(sigfix), DataType) && sigfix <: Tuple
-        if all(m->morespecific(sigfix, m.sig), meth)
-            print(io, "\nPossible fix, define\n  ")
-            Base.show_tuple_as_call(io, :function,  sigfix)
-        else
-            println(io)
-            print(io, "To resolve the ambiguity, try making one of the methods more specific, or ")
-            print(io, "adding a new method more specific than any of the existing applicable methods.")
+        let sigfix=sigfix
+            if all(m->morespecific(sigfix, m.sig), meth)
+                print(io, "\nPossible fix, define\n  ")
+                Base.show_tuple_as_call(io, :function,  sigfix)
+            else
+                println(io)
+                print(io, "To resolve the ambiguity, try making one of the methods more specific, or ")
+                print(io, "adding a new method more specific than any of the existing applicable methods.")
+            end
         end
     end
     nothing
diff --git a/base/shell.jl b/base/shell.jl
index c0537821638f3..f443a1f9c094a 100644
--- a/base/shell.jl
+++ b/base/shell.jl
@@ -211,8 +211,8 @@ function print_shell_escaped_posixly(io::IO, args::AbstractString...)
         first || print(io, ' ')
         # avoid printing quotes around simple enough strings
         # that any (reasonable) shell will definitely never consider them to be special
-        have_single = false
-        have_double = false
+        have_single::Bool = false
+        have_double::Bool = false
         function isword(c::AbstractChar)
             if '0' <= c <= '9' || 'a' <= c <= 'z' || 'A' <= c <= 'Z'
                 # word characters
diff --git a/base/weakkeydict.jl b/base/weakkeydict.jl
index 8e1a3d480b995..5b59949d35965 100644
--- a/base/weakkeydict.jl
+++ b/base/weakkeydict.jl
@@ -129,10 +129,12 @@ function get!(default::Callable, wkh::WeakKeyDict{K}, key) where {K}
 end
 
 function getkey(wkh::WeakKeyDict{K}, kk, default) where K
-    k = lock(wkh) do
-        k = getkey(wkh.ht, kk, nothing)
-        k === nothing && return nothing
-        return k.value
+    k = let wkh=wkh
+        lock(wkh) do
+            k = getkey(wkh.ht, kk, nothing)
+            k === nothing && return nothing
+            return k.value
+        end
     end
     return k === nothing ? default : k::K
 end
diff --git a/stdlib/REPL/src/LineEdit.jl b/stdlib/REPL/src/LineEdit.jl
index 5f5d81ead637e..ba69eaa3a2ad4 100644
--- a/stdlib/REPL/src/LineEdit.jl
+++ b/stdlib/REPL/src/LineEdit.jl
@@ -1979,11 +1979,11 @@ function enter_prefix_search(s::MIState, p::PrefixHistoryPrompt, backward::Bool)
         pss.indent = state(s, parent).indent
         pss.mi = s
     end
-    pss = state(s, p)
+    pss_ = state(s, p)
     if backward
-        history_prev_prefix(pss, pss.histprompt.hp, pss.prefix)
+        history_prev_prefix(pss_, pss_.histprompt.hp, pss_.prefix)
     else
-        history_next_prefix(pss, pss.histprompt.hp, pss.prefix)
+        history_next_prefix(pss_, pss_.histprompt.hp, pss_.prefix)
     end
     nothing
 end