change some ::AbstractString fields to ::String (#40569)

Author: JeffBezanson

base/array.jl

@@ -9,7 +9,7 @@ The objects called do not have matching dimensionality. Optional argument `msg`
 descriptive error string.
 """
 struct DimensionMismatch <: Exception
-    msg::AbstractString
+    msg::String
 end
 DimensionMismatch() = DimensionMismatch("")
 

base/channels.jl

@@ -295,7 +295,7 @@ function close_chnl_on_taskdone(t::Task, c::Channel)
 end
 
 struct InvalidStateException <: Exception
-    msg::AbstractString
+    msg::String
     state::Symbol
 end
 

base/compiler/validation.jl

@@ -51,7 +51,7 @@ const SIGNATURE_NARGS_MISMATCH = "method signature does not match number of meth
 const SLOTNAMES_NARGS_MISMATCH = "CodeInfo for method contains fewer slotnames than the number of method arguments"
 
 struct InvalidCodeError <: Exception
-    kind::AbstractString
+    kind::String
     meta::Any
 end
 InvalidCodeError(kind::AbstractString) = InvalidCodeError(kind, nothing)

base/errorshow.jl

@@ -9,7 +9,7 @@ This method is used to display the exception after a call to [`throw`](@ref).
 # Examples
 ```jldoctest
 julia> struct MyException <: Exception
-           msg::AbstractString
+           msg::String
        end
 
 julia> function Base.showerror(io::IO, err::MyException)

base/io.jl

@@ -15,7 +15,7 @@ struct EOFError <: Exception end
 A system call failed with an error code (in the `errno` global variable).
 """
 struct SystemError <: Exception
-    prefix::AbstractString
+    prefix::String
     errnum::Int32
     extrainfo
     SystemError(p::AbstractString, e::Integer, extrainfo) = new(p, e, extrainfo)

base/iostream.jl

@@ -13,7 +13,7 @@ Mostly used to represent files returned by [`open`](@ref).
 mutable struct IOStream <: IO
     handle::Ptr{Cvoid}
     ios::Array{UInt8,1}
-    name::AbstractString
+    name::String
     mark::Int64
     lock::ReentrantLock
     _dolock::Bool

base/libuv.jl

@@ -74,7 +74,7 @@ end
 ## Libuv error handling ##
 
 struct IOError <: Exception
-    msg::AbstractString
+    msg::String
     code::Int32
     IOError(msg::AbstractString, code::Integer) = new(msg, code)
 end

base/meta.jl

@@ -188,7 +188,7 @@ The expression passed to the [`parse`](@ref) function could not be interpreted a
 expression.
 """
 struct ParseError <: Exception
-    msg::AbstractString
+    msg::String
 end
 
 function _parse_string(text::AbstractString, filename::AbstractString,

base/missing.jl

@@ -12,7 +12,7 @@ where it is not supported. The error message, in the `msg` field
 may provide more specific details.
 """
 struct MissingException <: Exception
-    msg::AbstractString
+    msg::String
 end
 
 showerror(io::IO, ex::MissingException) =

base/simdloop.jl

@@ -8,7 +8,7 @@ export @simd, simd_outer_range, simd_inner_length, simd_index
 
 # Error thrown from ill-formed uses of @simd
 struct SimdError <: Exception
-    msg::AbstractString
+    msg::String
 end
 
 # Parse iteration space expression