Make edit(f) return methods if multiple signatures available (JuliaLang#39481)

Co-authored-by: Jameson Nash <[email protected]>

Author: 2 people

stdlib/InteractiveUtils/src/editless.jl

@@ -222,9 +222,16 @@ method to edit. For modules, open the main source file. The module needs to be l
 To ensure that the file can be opened at the given line, you may need to call
 `define_editor` first.
 """
-edit(f)                   = edit(functionloc(f)...)
-edit(f, @nospecialize t)  = edit(functionloc(f,t)...)
-edit(file, line::Integer) = error("could not find source file for function")
+function edit(@nospecialize f)
+    ms = methods(f).ms
+    length(ms) == 1 && edit(functionloc(ms[1])...)
+    length(ms) > 1 && return ms
+    length(ms) == 0 && functionloc(f) # throws
+    nothing
+end
+edit(@nospecialize(f), idx::Integer) = edit(methods(f).ms[idx])
+edit(f, t)  = (@nospecialize; edit(functionloc(f, t)...))
+edit(file::Nothing, line::Integer) = error("could not find source file for function")
 edit(m::Module) = edit(pathof(m))
 
 # terminal pager