Fix clear_module! world semantics (#2693)

Author: vtjnash

CHANGELOG.md

@@ -10,6 +10,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Added anchor links to admonition blocks, making it possible to create direct links to specific admonitions. ([#2505], [#2676], [#2688])
 * Added different banners for dev and unreleased docs ([#2382], [#2682])
 
+### Fixed
+
+* In Julia v1.12, the queries used by `clear_module!` will now be versioned by world, allowing the deleting of bindings to work correctly. ([#2693])
+
 ## Version [v1.10.2] - 2025-04-25
 
 ### Fixed
@@ -2029,6 +2033,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 [#2676]: https://github.com/JuliaDocs/Documenter.jl/issues/2676
 [#2682]: https://github.com/JuliaDocs/Documenter.jl/issues/2682
 [#2685]: https://github.com/JuliaDocs/Documenter.jl/issues/2685
+[#2693]: https://github.com/JuliaDocs/Documenter.jl/issues/2693
 [JuliaLang/julia#36953]: https://github.com/JuliaLang/julia/issues/36953
 [JuliaLang/julia#38054]: https://github.com/JuliaLang/julia/issues/38054
 [JuliaLang/julia#39841]: https://github.com/JuliaLang/julia/issues/39841

src/expander_pipeline.jl

@@ -1,20 +1,30 @@
 # Defines node "expanders" that transform nodes from the parsed markdown files.
 
+function clear_global!(M::Module, name::Symbol)
+    isconst(M, name) && return
+    if VERSION >= v"1.9"
+        Nothing <: Core.get_binding_type(M, name) || return
+        setglobal!(M, name, nothing)
+    else
+        Core.eval(M, :($name = $nothing))
+    end
+    return nothing
+end
+
 # helper for "cleaning up" content of modules to enable garbage collection.
 # See also <https://github.com/JuliaDocs/Documenter.jl/issues/2640>.
 function clear_module!(M::Module)
     # we need `invokelatest` here for Julia >= 1.12 (or 1.13?)
-    for name in Base.invokelatest(names, M, all = true)
-        if !isconst(M, name)
-            # see, e.g https://github.com/JuliaDocs/Documenter.jl/issues/2673
-            # it is not possible to set `nothing` to variables, which are strongly typed
-            # still attempt to set it, but ignore any errors
-            try
-                @eval M $name = $nothing
-            catch err
-                @debug "Could not clear variable `$name` by assigning `nothing`" err
-            end
+    for name in Base.invokelatest(names, M, all = true)::Vector{Symbol}
+        # see, e.g https://github.com/JuliaDocs/Documenter.jl/issues/2673
+        # it is not possible to set `nothing` to variables, which are strongly typed
+        # still attempt to set it, but ignore any errors
+        try
+            Base.invokelatest(clear_global!, M, name::Symbol)
+        catch err
+            @debug "Could not clear variable `$name` by assigning `nothing`" err
         end
+        VERSION >= v"1.12" && Base.delete_binding(M, name)
     end
     return
 end